The Variety of Shells

A shell is a hard casing or covering in some sort and they can be made out of all kinds of things. There are plenty of calcium-based shells. Shells can be keratin in the case of like a, I think, an armadillo. Do my fingers have shells? I think they do. Is your skull a shell of a type?

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From eggs to tacos to Ninja Turtles, some of the best things in life come in shells. So cozy on up inside the nearest conch as we regale you with tales of shells from all across the scientific spectrum!

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[Trivia Question]

Golden ratio nautilus shells

https://link.springer.com/article/10.1007/s00004-018-0419-3

[Fact Off]

Batteries made from crab shells

https://www.cell.com/matter/fulltext/S2590-2385(22)00414-3

https://www.sciencedaily.com/releases/2022/09/220901135827.htm

https://www.thedailybeast.com/the-future-of-renewable-energy-may-be-this-battery-made-from-crab-shells

https://www.sciencedirect.com/topics/engineering/cycle-life