Why Do Bad Eggs Float?

By Anupum Pant

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Instead of cracking up an egg which has been stored for a long time, to end up disgusted by the ‘rotten egg smell’, or the smell of a gas called Hydrogen Sulfide, a simple and a fairly well known way to check if an egg has gone bad, is to drop it in a glass of water and see if it floats. I found out about this first, from an article written at Frugal Living, and spent some time to confirm its claims – Bad eggs float.
If you take my word for it (you should!), it really does work. The article describes this three-point test to find out if an egg is good to eat.

  1. If the egg sinks and lies on its side, it is a fresh one. It is good enough to be eaten.
  2. If it sinks and stands up on a point, or is at an angle, it is good enough. You can still use it up for making hard-cooked eggs or bake it.
  3. But, if an egg floats, it needs to be discarded.

Why does this happen?

To understand, you’ll have to think of a chick – a young chicken.

Poor Chicks: Before chickens come out of the egg, they develop lungs and need oxygen to breath. Sitting inside a sealed egg, with no cords attached, for the chick to survive, oxygen has to come in from somewhere. For that, let us look inside.

Egg Science: The outer shell of an egg has two membranes under it. When an egg is laid, it is warm and starts cooling which contracts the inner part of the egg more than the shell and pulls the two membranes apart. As a result, air gets trapped in between the membranes (not enough air initially for it to float).

How does the air come in? The shell of an egg isn’t as simple as it looks. It has about 7000 tiny pores in that shell which let the air pass in and let the carbon dioxide pass out of it. This is how the chick breathes. And the reason, eggs boiled in colored water during Easter, get colored from the inside.

So, as there are pores present in the shell, bacteria enter the egg and start decaying the biological matter inside. This produces a smelly gas (and other gases too), Hydrogen Sulfide (also present in smelly farts). The gases from this decomposition, and the air from outside, keep increasing in volume as time passes.

Corollary: This is exactly what explains these floating bad eggs – Greater the amount of gas inside, older is the egg and the better it floats in water.

Side note: Egg shells and the two membranes inside have the ability to stop the invasion of micro-organisms and bacteria, but over time bacteria manage to enter.

Things You Should Know About Farts

by Anupum Pant

Flatulence, an expulsion of intestinal gas, commonly known as fart, is something no one likes to talk about because it is considered a taboo, almost everywhere in the world. To top it all, some might even sideline this article by tagging it as a vulgar one. In my defense, that is exactly the purpose of my blog – To talk about things no one will talk to you at school (or anywhere else). Our inclination here is to learn.

Avoid shaming others for it.
Firstly, it is important to know that, irrespective or gender, race or nationality, farting is an invariable result of digestion and everyone does it about ten times a day. Even dead people fart. So, by shaming someone for letting it out in an accidentally loud way, is hypocritical on your part; it [shaming others] can be avoided. As Eric Auld says, it is okay to fart.

Do not hold it.
Secondly, it is not okay to hold flatulence to avoid embarrassment. Doing this, has the potential to cause a life threatening condition called diverticulitis. This disease is prevalent among the urban people for obvious reasons. Urban people have a greater societal pressure to hold it, than a free-living farmer. To give you an idea, 30 million Americans are currently suffering from it (old data).

What is it?

Principally, it is a mixture of gases taken in through mouth with food and gases which are produced while digesting food. The composition of ‘gas’ varies with, people, the kind of bacteria in their stomach and the kinds of food they eat. Oftentimes, people don’t hate their own smell; at the same time, detest the gases coming out from others. A fart is comprised of gases like Hydrogen, Nitrogen, Carbon dioxide, Oxygen and Methane. It smells bad due to the presence of Hydrogen Sulfide, Mercaptans and Ammonia. And the presence of inflammable gases like Hydrogen and Methane makes them inflammable.

Farts in a humid environment can seem worse because during such conditions, our sense of smell is enhanced. This is the reason why farts smell worse in a shower.

Minimizing the effect

Although, there is no way you can end this trouble from your life, you can adjust your diet a bit to prevent this from happening in excess. Beans, cauliflower, corn, eggs etc are some foods which are notorious for producing gas in your body. These foods release a relatively greater amount of gas than other foods while getting digested in the intestines. Cutting their intake can help (of course consult your doctor first).

Another way to lower the problem is to prevent the odor from troubling others. This can be done by using products like “odor-proof undies”.

Coughing or suddenly moving your chair could help you to mask the sound.

 

A Bat’s Inverted Sleep Position

by Anupum Pant

I have written about sloths in the past. In that post, we appreciated the way their bodies are engineered to stay inverted for most of their lives. It turns out, a bat’s body is designed (rather evolved) in a similar way, which enables them to relax and sleep upside down. In this post, I would like to discuss – why did they evolve this way and how do they do it?

If you are interested to know more about bats, you will definitely like this post from the archives. [Bats can See]

How can bats manage to sleep like this?

Humans sleep in a horizontal position, cows sleep with their eyes open, horses sleep in a standing position, and of course, bats sleep in an inverted position. What makes an animal sleep in the position they do, is basically their anatomy – the way their bodies are designed. While sleeping upside down might seem as an anomalous behavior to us, it is a normal position for the bat’s body. Like we don’t exert energy when we are lying down, bats’ bodies don’t consume extra energy for hanging down like that.

Firstly, a bat’s claw is like a hook. A better way to understand why this helps is, to look at a converse behavior – the way a human hand works. We use up energy to contract tens of muscles and make up a hook with our fingers; this is not a normal state of our hand. Also, our relaxed hands are open where we don’t exert any energy and we sleep with our hands in that position. A bat’s claws are designed in a completely inverse fashion; they are hooked in the normal position. They don’t take up energy to make them into hooks, they are like that. And they sleep like that – which enables them to hang without using energy.
So, unlike our hands, a bats’ closed fist is their relaxed position. They have to contract tendons and use energy to open them up. This anomalous talon design allows them to hang in a relaxed position.

Bat's Talons - Normal position

Secondly, unlike every other bird, a bat can’t take off from an upright position, or from the ground. They have to be inverted to start flying. This is because they have relatively weaker wings which can’t make them fly from a stationary position. Think of an X-51A Waverider, which has to be carried on a B-52 plane and dropped down to start a flight. They drop down for a very small amount of time and beat their wings vigorously to start a flight. Since, they have to wake up inverted to go flying and catch a meal, they go to sleep like that.

Why did they evolve this way?

They’ve evolved this way to simply stay away from the predators:

  1. By hiding up in a place where not many predators would look – under a bridge, roof of the cave and dark tree canopies. Also, at places like these, they don’t have to compete with other birds for a place.
  2. And by escaping quickly in case of an attack by attaining instant flight [see above].