Pando – An Organism That Weighs 6 Million KG

By Anupum Pant

Blue whales weigh about 150 tons each. That is a 150,000 kg animal we are talking about! Incredible! It is the largest animal to have ever lived on earth. Yes, bigger than any of the dinosaurs. Just for the perspective, the heart of a blue whale can weigh about 600 kg and is almost the size of a Volkswagen Beetle car. A human can fit in its arteries. But, if you thought no other organism can be heavier than a blue whale, you are in for a surprise.

The heaviest organism we’ve ever found, lives in the Fishlake national forest, Utah. In fact, the organism itself is the forest. This forest is a Vatican-city-sized forest which looks like it has several identical trees in a normal forest. Only what looks like identical trees in a normal forest, is actually a single huge tree.

The absolutely humongous tree is known to have come out of a single seed about 80,000 years back. With time, it went on to spread its roots and has cloned itself by popping out about 47,000 other extant clones.

Since it is a single huge tree, it indeed acts like a single huge tree. When one of the shoots (tree) is in need of nutrients, the interconnected root system makes sure that the tree gets what it needs. Also, these trees transition from winter to spring simultaneously, just like a single huge tree would.

MinuteEarth explains it better in the video below:

An Extremely Rare and Bizarre Disorder – Alien Hand Syndrome

By Anupum Pant

Like lakes, bizarre and rare disorders also fascinate me. Of course I would never want to experience one of these, but it’s good to know about them. Besides the horrible, body-turning-into-stone disorder, Alien hand syndrome is one of the most bizarre disorders I’ve heard of.

If someone has the Alien hand syndrome, they’d have a hand that would move around and do stuff on its own without the person even being aware about it. And I’m not talking about those involuntary muscular movements you have once in a while. In this, the hand moves as if it can think for itself. It moves as if it’s being moved by “someone else”. Some times, it becomes necessary to use the other hand to stop it!

Imagine your left hand grabbing an object and you just can’t let it go.

It happens when the two hemispheres of the brain get separated either surgically or by accident or disease. In that case, the left and right hemispheres are unable to move information between them.

It isn’t just rare and bizarre, it’s extremely scary too. Imagine if your left hand waking up at night to murder its own host. At night, it’d like sleeping with a stranger. In fact, it’d be like living with a creepy stranger all the time. Who would want that!

Like the following video puts it, it seems as if there is another intelligence at work here, the one which is not known to the patient.

[Wikipedia page]

Please hit like if you learnt something today.

It Sure is Magnetic, But is it Solid or Liquid?

By Anupum Pant

Figuring out if glass is a solid or liquid is pretty straight forward. This putty in the video however, behaves a lot like pitch (the same thing that was used for the world’s longest continuously running experiment). On applying a greater and abrupt impact, it shatters like a ceramic. While it flows like a liquid if you let it. But that is not even the point.

The point is, it can be magnetized! And it sure is another one of those awesome science toys you can have on your desk all the time. By the way, the other ones are Gombocs, constantwidth objects and feel flux. It must so much fun to play around with such a gooey magnetic material (putty). Some good soul will gift it to me for my birthday…may be.

It stretches, bounces, breaks, flows, can be magnetized and what not! It’s like the ferro fluid, but more awesome. Even this, like ferro fluid, has very very tiny magnetic particles dispersed in a putty like substance which makes it magnetic.

Who wouldn’t want to try out that Neodymium magnet swallowing trick! Since it looks like it’s live, they call it the magnetic thinking putty. Perfect name, I must say.

Everyone Knows Magnet in a Copper Tube, But this…

By Anupum Pant

I’m sure you know that if you let a strong magnet drop along a thick copper tube, the magnet falls in a very interesting manner. It falls slower than it normally should, delaying the span of the fall, as if gravity acting on the magnet mysteriously drops. If you haven’t heard about it, I’ll give it to you, you probably aren’t a YouTube addict, and that’s definitely good (and maybe also bad because there’s awesome stuff out there which you are missing). Just watch this, what I just said will start making sense…

Why does this happen?

OK, that’s pretty cool, but you knew about this little magnet-copper trick already, and you were expecting something more? You got it.

Whatever you just saw neither was a magic trick, nor was the Copper tube acting as an anti-gravity machine. This is pure science, can be easily explained by it. Here…

When a magnet moves quickly near a metal, it generates current in the metal. Here, current is generated in the Copper tube.
The current generated in the tube generates another magnetic field which opposes the magnetic field of the magnet and pushes the magnet upwards, away from the force of gravity. Gravity being stronger, pulls it down, but not with as much force because the magnet is being pushed in the other direction too. That’s the simple science behind it.
Still, someone else could explain it better on a page which is completely dedicated to explain it to you. [Here] and [Here]

But, you probably knew even that -The trick and the science behind it. So, there’s more for your-kind-of-people.

A new skill-toy that uses the same…

Feel flux. An amazing new skill toy that works on the same principle. Who would have thought, playing with gravity could get fun. The crowd funding campaign for it runs on indiegogo. Go fund it!

Extreme Bionics – Artificial Limbs as Good as Real Ones

By Anupum Pant

Hugh Herr is an American rock climber, engineer, and biophysicist who lost both his limbs below the knee due to a bad climbing accident. He now heads the MIT Media Lab’s Biomechatronics group. In the following talk he talks and shows off an incredible new kind of prosthetic they’ve developed.

The guest appearance of Adrianne Haslet-Davis, a dancer who lost a limb in the 2013 Boston bombing, makes it so touching. Don’t miss that.

So, here Herr giving one of those greatest talks you’ve ever seen. It’ll makes you realize how science is bringing closer a glorious future. If we keep moving at this pace, soon there will be a day when there will really be no disabilities. That is all I want to say.

Not all “Scientific Studies are to be Trusted

By Anupum Pant

On this website I’ve discussed so many random studies that kind of shock you at first, but let me tell you, you shouldn’t always trust these “scientific studies”. Always take them with a pinch of salt. Most of the time, like the study “finding IQ by looking at men’s face“, these seemingly shocking studies are usually initial steps in a scientific area which pave a way for new research.

And then there are these institutes like George C. Marshall Institute set up to do fake science and create propaganda on various issues.

Besides that, there is science journalism. The headings these articles use, almost all the time are crafted to grab attention and clicks. You should have your own opinion of whatever you read on these science journalism websites. These articles appear on Awesci too.

This Ted-ed video perfectly explains how imperfect clinical trials are. You can extrapolate the video’s concept to other “scientific studies”. It really makes you aware of how misleading some studies can be.

So, before jumping to any conclusions after reading these crazy sounding headlines backed by “scientific study”, make sure that you read the complete article and that you do it on other websites too.

Aluminium Used to be Costlier than Gold

By Anupum Pant

Unlike gold and silver, there is enough Aluminum in the world. It is in fact, the third most abundant element in the Earth’s crust. Also, it is about two times more abundant than Iron – an element which has a complete  branch of metallurgy revolving around it – Abundance of Aluminium is 2 times of that! Still, for the middle class of the 19th century, bricks made of Aluminium were things they could only dream to buy – Aluminium costed more than gold back then.

The same metal, Aluminium, certainly shines like silver. But our generation almost has no respect for it. Today, it is one of those blasé metals that is used to make disposable soda cans.

Back then, the US, to show off its wealth, decided to cap the Washington monument with a 3 kg pyramid of Aluminium. Later, since enterprising individuals found out a way to extract it in a very efficient manner, Aluminium became something that was not all that rare. People in the 19th century knew how precious it was. That was because, back then there was no good way to extract aluminium from its ore.

In the 19th century Napoleon III invited the King Siam to a dinner. He then gave himself Gold Cutlery, his troops Silver & the King of Siam Aluminium. This was no insult but an honour because aluminium was the most valuable metal on the planet at that time. Today, aluminium is $1,800 a ton while Gold is $50 million. – [Source]

In the mid-1800s, an Aluminum ingot would sell for about $550 per pound. Fifty years later, it costed around 25 cents for the same amount. What changed? Extraction.

The Evil Powdered Alcohol or Palcohol

By Anupum Pant

As if liquid alcohol wasn’t itself causing enough menace, now we have this futuristic powdered alcohol. They call it “Palcohol”.

All you need is, to mix a little of it with water, and there, you have your doze for the day. Other way to consume it would be to snort it for an “instantaneous high”, which by the way, is nothing less than deadly.

On an unrelated note, I find the host of this show is so adorable.

Problems

  • Palcohol certainly makes it easy for kids (and others) to carry alcohol around, and also to move it into places where it isn’t allowed (football games and concerts), which is definitely not desirable.
  • Also, the powder is highly flammable. Who wants a bomb in their pocket?
  • Another really bad thing about it is that it can easily kill you. Snorting can damage your mucous membrane. Also, since it is alcohol in high concentration, you can easily overdose on powdered alcohol and pass out.
  • The nightmare of every person, date rape, well, that just got a lot easier. Scary! How easy would it be for a creep to slip this powder into a drink of an unsuspecting victim – This is also Lacy’s primary concern (watch the video below).
  • So many new laws need to be in place before it gets available for public.

The patent to create powdered alcohol was published long back, in the 70s, but it is only now that they have got a federal approval. However, the Fed’s approval was taken back due to some issues. It is interesting to note that several other countries like Japan, Netherlands and Germany already have such products that are being sold in the market. How do the authorities in those countries  deal with this menace!

Nevertheless, Palcohol, a new and improved way to get drunk is here. It’s not going back.

Good news (?) is that it can be made at home. Read this PopSci article for the recipe.

I see only problems with Palcohol. I don’t think it needs to be in the retail market. What do you say?

$20 Parking Ticket to NASA for Parking on an Asteroid

By Anupum Pant

Michael Stevens from Vsauce never ceases to amaze me with his facts. Recently, while watching a video on the channel, I noted this interesting story.

About 11 months before NASA’s ‘NEAR Shoemaker’ spacecraft landed on the asteroid 433, Eros, Gregory W. Nemitz claimed its ownership. He somehow got it registered and waited for the NASA’s probe to land on the near earth asteroid.

The asteroid was estimated to hold several million billion dollars of platinum. When NASA landed their spacecraft on Eros, Nemitz prepared an invoice of $20 and sent it to NASA. According to him, the parking rates on his extra-terrestrial land were $ 0.20 per year and he had decided to charge them to cover the next $ 100 years of parking.

NASA of course refused to pay and sent him a letter denying the payment. In the year 2003, Nemitz filed a case against NASA, saying that they had defaulted his payment.

The judgement was of course against Nemitz as he wasn’t able to prove the actual ownership. There’s no way he could have. Michael explains why…

[more]

Is Global Warming Real? You’ll Find Your Own Answer

By Anupum Pant

In the year 1964, the surgeon general of U.S. Public Health Service released a comprehensive scientific report that linked cigarette smoking to several deadly diseases. Of these diseases, the worst were lung and laryngeal cancer.

Even after 10 years from when this report was released, the real dangers linked with cigarette smoking could not reach the public. And even today, after having killed 100 Million people in the last century, not everybody believes that this deadly habit, really is a deadly one. There was a reason for that…

In the face of all the scientific evidence and reports, people were still being convinced to smoke, by elaborate campaigns. Before 1964, the ads promoting smoking were too absurd. But, even after 1964, when the report was released, this propaganda did not stop. In fact it blew up, as if to cover up the scientific evidence, as if to nullify the findings of the report, to seed a doubt, and to keep the public from recognizing the truth. People were being coaxed to smoke.

Fake science

Fake science was being conjured up to disprove the findings of the 1964 report. A doubt was being created in the minds of the public. The tobacco industry, a flourishing one, was funding various institutions to create fake studies that create a doubt in people’s minds. These were real scientists who were being paid to speak.

And now people started thinking that there was an actual debate going on between scientists. They thought, since scientists weren’t too sure about the harmful effects, they need not be careful with cigarettes.

Dr. Fredrick Seitz was one big player in this. He was a founding chairman of the George C. Marshall Institute. The job of people at this institute was to popularize cigarettes (or tobacco) by creating a doubtful atmosphere, saying with phony scientific studies, that the scientists who said cigarettes caused cancer, were not really sure about what they said.

The same institute ran several campaigns against the dangers of other actually dangerous things like acid rain, ozone depletion and DDT. They said acid rain, ozone depletion and DDT weren’t really harmful. In return, they were being funded big bucks from major businesses.

Their campaign against the dangers of cigarettes delayed the response of general public by a decade. Roughly, you could even say that this very campaign was one reason that caused 10 Million deaths. They probably weren’t happy that their fake science was killing masses. But they were getting paid well. Wasn’t it a massacre?

The Next Big Thing

Pro-cigarette and others were relatively smaller campaigns. Now, they were on to something big. This time, it was the largest conglomerates – Petroleum industry – in the world who wanted to fund the institute to create phony science that would create a doubt about global warming. The petroleum industries did not want their industry to collapse after the real science came out with results that could hurt them. They wanted to create a delay in the response from the public. Just like the decade’s delay which happened after the 1964 report.

This time the lives of millions are not at stake, it’s Billions.

Now do you really think  that global warming is a delusion? Are scientists really doubtful if the world is getting hotter? Or a fake doubt is being created by the likes of George C. Marshall Institute.

Here is the video which educated me about it:

You probably have your answer.

There is no doubt. Global warming is real. The doubt that is being created is a phony one.

Hit like if you learnt something.

A Thread Around the Earth

By Anupum Pant

Background

Couple of days back, I read about a puzzling geometrical conundrum, probably on Quora. It might not sound amusing to you math geeks out there, but to me, it sounded like an impossible thing at first. The sad part is, I did not save the source link in my notes. Thankfully, I did care to note down the idea. Let me call it the “Thread wound Around the Earth” puzzle.

Here is a simple question first. Try answering it without any calculation. Just guess. Be honest to yourself, don’t see the answer just below it. Scroll slow.

As BBC’s website puts it…

Imagine a piece of string wrapped around the Earth’s equator – that’s about 40,000km. How much MORE string would you need for it to sit 15cm above the ground, all the way around?

A) 1 metre, B) 1 kilometre or C) 1,000 kilometres

Thread wound around the Earth

The answer is A) 1 meter. Yes, just 1 meter of extra rope.

Suppose, you have an outrageously long thread with you. You tie it around the base of a tree, somewhere at the equator. Now, you go around the earth, along the equator, carrying the thread with you, till you come back to that tree where you started. At this point, you’ll have a thread that goes around the earth in a circle. At every point, let us imagine that the rope is taut and touching the ground (there are no mountains or valleys in between). It’s a perfect circle (assume).

Suppose, you still have an extra meter of the rope left now. So, you break the wound rope at one point and add the extra meter to it. That of course slackens the wound rope. For this rope to be taut again, it has to be lifted up by some amount. What do you think that distance would be from the ground? Assume that the rope still makes a huge circle just above the ground and lifts by equal amount at every point along the equator.

Just the extra meter of rope, causes the rope to rise by ~15 cm all around the earth (actually 15.9 cm). For a single meter of rope added to a 40,000 km of rope, that sure seems like a huge lift! But that isn’t all…

rope 15 cm above earth

The most amazing part is that, no matter what the size of the circle, a meter of increased circumference will increase the radius by ~15 cm. Always!

Try tying a rope around a golf ball, or even try doing that around the sun. It’s always that – 1 meter increase in circumference, always increases the radius by ~15 cm.

The Math is so straightforward.

If you think about it mathematically, it is completely straightforward.

Radius X 2 X Pi = Circumference

That means, the Radius is directly proportional to the circumference of a circle. Everyone knows that. So, the amount of change in the radius is reflected proportionally in the circumference, the magnitude of radius can be anything, really. So it’s pretty natural that just a single meter of rope is required to lift the rope by 15.9 cm around any circle. The size doesn’t matter. But practically thinking, the above question makes it seem impossible.

Please hit like if you learnt something from the article.

Is Helium Beer Possible?

By Anupum Pant

Background

For the fizz, almost all beers have carbon dioxide dissolved in them. However, some others have also experimented with Nitrogen beers. But as fas as I know, no other gases have been used to make beers. Tell me in the comments section if you know any other gasses that have been used to do this.

But, on April 1st  Samuel Adams announced a Helium beer on his YouTube Channel. Note, the date was 1st  April. Here is the video of the announcement.

Save Helium and Science of the Fake Beer

Of course it was an April fools stunt. But what if it was real?

In his “HeliYum beer” Adam announced that, instead of carbon dioxide to create the fizz, he had used the Helium gas in the beer. In the video, as an additional effect, the new beer gas also created a funny atmosphere by affecting the voice of beer tasters. Now, I certainly didn’t like the idea of using Helium to keg beers because I’m very touchy when it comes to wasting the precious gas – Helium. Why? Well, read this Helium article I wrote some time back.

Also, I was adamant in believing if it was even possible to do that. Firstly, the date was 1st  April. Secondly, the science clearly didn’t allow this. Here’s why…

1. Helium is about 700 times less soluble in water as compared to carbon dioxide. It is one of the least soluble gases in water and only about 0.0016 g of Helium would get dissolved in a litre of beer. While, at the same conditions, 2.5 g of carbon dioxide is usually present in a litre of beer. This dissolved carbon dioxide is what realeases slowly and creates the fizz. No slow fizz can be done with Helium. Undissolved helium in beer would coalesce into one or two big bubble and…ploop, would go out as soon as the seal would break.

2. Even if Helium was forced into the beer and sealed in a beer can, it would be useless. As soon as the seal would break, all the meaningful amount of helium present inside, undissolved, under pressure, would come out so quickly (due to less viscous beer) that it would bring out a lot of beer with it. It would create a mess. And you wouldn’t be able to even bring the can near your face by the time the whole gas goes away.

Had carbon dioxide been used for the same purpose, the gas would, like it normally does, come out steadily. It would make the bubbles last.

Verdict: No. It’s useless to try to make beer with Helium unless you make it so viscous that it won’t let the Helium pass so easily. In that case, it won’t be beer really. Also, I’m not sure if the fermentation process could take place in such a viscous condition.

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Seeing With Your Tongue and Listening to Colour

By Anupum Pant

I’m always fascinated when I see one sense organ do the work of some other sense organ. Like breathing from your eyes ( not really) or seeing with your ears (really) listening to colours etc…

not available in your country

Solving The Technical Problem (Not available in your country): Today, I stumbled upon a video whose title was “Blind Learn To See With Tongue“. It was uploaded on YouTube by CBS – an American TV network. The sad part is that they had tweaked the videos settings which did not allow me to watch it. It wasn’t available in India.

Whenever someone says I can’t do something, I’m almost always prepared for it. This time, I had this extension installed on Chrome called ZenMate. It’s perfectly legal (available on chrome store) and works very smoothly. It allows you to surf the internet with total control. With it installed, you can totally forget about your physical location and fool the websites which place a location restriction for access, like Spotify and Youtube’s “not available in your location” videos. I haven’t tried other things but it should allow Indians to access stuff from websites like Hulu, Pandora and Netflix. (Even if it may seem out of place, I wasn’t paid by ZenMate to write this. I really recommend it.)

The Customary David Eagleman talk

Now, whenever I come across something that has to do with seeing things with an organ that is not really meant for seeing, I remember this very-old TED talk by David Eagleman. And I like to attach it to my blog because I can’t really explain this amazing ability of the Human brain as well as he does. He basically segues his talk to discuss how brain can learn to interpret various kinds of signals to produce an image. So, here it goes. Watch it and read on…

Since it is clear that seeing is the ability of the brain, not eyes, we can comfortably move on to see how you could even see with your tongue – Tasting the light.

Seeing with the Tongue

A device called BrainPort can help you do that. The contraption consists of a camera that sits on your forehead and sends information to a small computer. The information is processed, converted into electrical pulses, and then sent to an array of electrodes touching your tongue. The brain processes these signals and converts them into an image.

At first, of course the brain doesn’t know the trick to process visual signal from the tongue, but it learns. Gradually the device becomes a part of your body and you start seeing with your tongue! Just like Neil Harbisson can listen to colour. In fact, he can see more colours than our eyes can see because the technology allows him. He can see infrared and ultraviolet too!

Listening to Colour – TED talk


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The Sweet Tale of the Mysterious Tree Lobster

By Anupum Pant

I do realize how big our world is and the sheer number of species that live in it. Also the fact that about 86% of the species are still unknown has me in awe all the time.

Yet, after having read about so many kinds of animals that live on our planet, after having documented them on this blog, I always feel that I’ve known and written it all. The very moment I start losing hope that I would never find an interesting animal ever again, something incredible comes across. Always!

Today, that happened again when I was reading an NPR blog. This time, there’s more than the species itself. The place where it lives is pretty awesome too. The most amazing part – This six-legged giant lives only there. That means, nowhere else on Earth will you find it! First, let’s see where it lives…

This is where it lives:

balls pyramid

I know, it looks like a CG mountain done for a fantasy movie. Trust me, it’s real. It’s called the Ball’s Pyramid (named after a European named Ball who first saw it in 1788) and was formed 7 million years ago due to a volcanic eruption. It is an awkwardly tall (1,844 feet) and an extremely narrow rock sitting in the centre of the sea. To the East of Australia, the red place marker in the following picture shows where the rock is located.

 balls pyramid location

 What lives there? And how was it found?

There is an island – Lord Howe island – close to the rock. In the island lived huge “tree lobsters” (actually they were huge stick insects with a hard exoskeleton – Dryococelus australis). In the year 1918, a ship crashed on the island and brought with it some rats. The rats loved these tree lobsters and finished them off within 2 years. After 1920, these tree lobsters were thought to be extinct.

tree lobster

Of course there were stories of these insects living on a rock near the island. But no human wanted to climb the narrow rock to hunt insects at night.

Only in the year 2001 when 2 researchers David Priddel and Nicholas Carlile decided to climb up the rock to find out if these stories were real, they found something incredible. Poop of a large insect. When the came back at night to investigate, the shiny black huge tree lobsters were found! These insects had probably never been extinct.

For more than 80 years, 24 of them had been living on this rock, in a bush and no one knew how they got there. Probably they clinged on to birds or something. Also, according to the researchers, these creatures have never been seen anywhere else.

Where are they now

I’m not sure about where they are now. According to the 2012 NPR article which I read, a pair of these creatures – Adam and Eve – were brought into Australia. Eggs got laid and little Tree lobsters came into the world. Thankfully, the species was saved from going extinct. But it isn’t known if they’ll be sent back to their home island because the great-great-great grandsons of those rats must still be there waiting to finish these insects off again.

This is how the first ones hatched in the zoo…

Hit like if you learnt something from this article.

Carrots Don’t Really Make your Eyes Better

By Anupum Pant

I have been lied about taste areas on the tongue, gas station & cellphones and what not! I feel everything I have ever known is wrong. And here we have one other myth that got busted today. I always thought was true. Thanks to the following Vsauce video (0:28 seconds) which opened my eyes and sent me to research on this topic.

I was so sure about carrots helping your eyesight that I had never questioned this belief. My parents told me, the doctors told me, my teachers and every one else (even Kawaii) told me.

Eat more carrots. Carrots will improve your vision.

eat more carrot kawaii

The truth about carrots

The truth is, carrots of course are good for the health of your eyes like any healthy diet is, but they don’t improve your vision. You won’t start seeing in the dark if you eat more carrots. Your normal diet gets you enough of vitamin – A to keep your eyes healthy. Carrots do no extra magic.

Carrots contain a substance called beta-carotene, which gets converted into vitamin – A and as everyone knows vitamin – A is good for your eyes. Of course the lack of vitamin – A in your diet could land your eyes in a problem. But you normally get enough of it through a normal diet. You don’t need carrots to keep your eyes disease free. Any more of vitamin – A supplied by carrots isn’t going to make your vision better. 

What is more interesting is how this propaganda started…

The Interesting Myth Origin

Turns out, “carrots make you see better” was a widespread World war II propaganda, clearly a bold faced lie which was used to save London from the tyranny of Nazi. It probably did better than the best email scam ever. The lie blew up, and today it has reached almost every living kid. I’m pretty sure even textbooks mention this.

During the WWII, the Royal Air Force started using radar to spot Luftwaffe bombers at night. But they wanted to keep this trick of their’s a secret. To achieve secrecy What did they do? They started a propaganda.

A story came into existence. According to it, a very skilled British Pilot, “Cats’ Eyes” who ate a lot of carrots, had developed a night-vision of sorts, and had gained the ability to spot German bombers at night by just tweaking his diet habits. British civillians loved the story and started eating more carrots. They thought it would improve their vision and they’d start seeing at night. The story spread like wild fire. Who would have known that the Cats’ eyes story was a propaganda issued by the Navy to conceal their use of radar technology.

[Read more]

The propaganda of course did save London.

Too much of anything is bad

FYI: Like too much of anything, even too much of Vitamin – A can be toxic. Deaths rarely happen due to this. But, they do!
Also, eating too much carrot may overdose your body with beta-carotene and could cause Carotenemia. As a result, your skin would turn yellow. It looks like jaundice, but it’s harmless and easily reversible.