Trilobite Eyes: Calcite Eyes Last Forever

It makes great sense to us today that we, or for that matter, so many other living beings around us, have eyes that are made up of organic matter. I’m specifically talking about the lenses of our eyes which are made up of organic material like crystallin. These are squishy, jelly-like biological materials which can change shape as muscles pull them and can focus on objects at different distances. Totally makes sense. But these won’t last long.

Imagine getting extinct, organisms finding our fossils a million years later wouldn’t have the slightest idea of how exactly our eye lenses worked.

Eyes of stone

Whereas the earliest creatures which started seeing, about 400 million years ago, had eyes literally made of stone. Their eyes, unlike any of our eyes would ever be able to do, have been preserved in the fossils we uncover today. [NCBI]

Some of the earliest Arthropods that we know of, belonging to a fossil group called Trilobites had eye lenses that were made up of this transparent mineral Calcite (Calcium carbonate). The closest existing relative of these creatures today are the blue blooded Horseshoe crabs.

The kinds of eyes

Broadly, they were of two types.

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On Not Knowing

That someone out there would point out, you do not know something, something which is widely popular and somehow you missed it, is a great social fear we live by today.

The fear of missing out on something, snubs some part of you that prevents you from coming out honestly and laying your guts out in the open. There simply is only a negative social incentive for you to be honest about your unawareness, because of the fear.

Like try telling someone that you have never heard of this thing called GoT everyone is talking about. Or Pokemon Go, or the Apple’s latest iPhone model. “Do you live under a rock?,” they will say.

Trust me, there for sure is someone out there who has never heard of it.

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The Great Pyramid is not Your Average Square Pyramid

Over the years, I have been fed with one shocking new fact a time about the Pyramids the Egyptians built over 3,800 years ago. Although not anywhere even close to being a new fact, this is the latest fact I have uncovered about the Great Pyramid of Giza, or the Pyramid of Khufu – The largest and the oldest of all the three pyramids in the Giza pyramid complex.

When observed carefully, what actually looks like an average square pyramid with four visible sides, that actually isn’t the case. Technically, there are eight visible sides. Here’s an exaggerated cartoon of what I mean by the eight sides.

concave2

In fact, the Menkaure, the third pyramid at Giza and the Red Pyramid at Dahshur have also been observed to have a similar concavity to each of their faces!

I know it is hard to believe, just because not many a people talk about it. For that, here are a few images of what it looks like from up above.

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