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Insect Has Gears in Its Legs (2013)

nationalgeographic.com

11–20 of 42 posts

Re: Insect Has Gears in Its Legs (2013)

#11

It seems to me there is still so much to learn from nature. Something that is impressive to me is how insects manage energy, tiny things moving or flying around and processing information for hours with I don't know what source and storage for it. I am obviously a total ignorant in physics and biology.

Whenever you're into microelectronics and robotics you cannot not be amazed by insects, those things are so ridiculously fantastic yet completely mundane (or annoying) for most of the world.

Re: Insect Has Gears in Its Legs (2013)

#13
post #8

I wonder if it’s possible for a creature to have axles and some kind of differential?

This is video is really aimed at kids but gives some good explanation of why it's likely impossible: https://youtu.be/YkS1U5lfSRw

The "gears" on this insect are basically intersecting teeth on two otherwise normal leg parts. Evolving an axle or any other free spinning part would require disconnected parts. The external parts would be cut off from any metabolic functions of the main body. Nothing remotely like that has ever evolved before so it would be nigh impossible.

Re: Insect Has Gears in Its Legs (2013)

#14
post #13
post #8

I wonder if it’s possible for a creature to have axles and some kind of differential?

This is video is really aimed at kids but gives some good explanation of why it's likely impossible: https://youtu.be/YkS1U5lfSRw The "gears" on this insect are basically intersecting teeth on two otherwise normal leg parts. Evolving an axle or any other free spinning part would require disconnected parts. The external parts would be cut off from any metabolic functions of the main body. Nothing remotely like that ha…

It seems to me this "impossibility" might be an artifact of definition: if some system contains disjoint parts, we no longer call it "an animal".

Colonial animals are the edge case here. Most would be hesitant to say an ant colony is "an animal", but are happy to refer to a Portuguese Man 'o' War as such, despite also being a colony.

Re: Insect Has Gears in Its Legs (2013)

#15
post #13

Earlier quoted context omitted.

This is video is really aimed at kids but gives some good explanation of why it's likely impossible: https://youtu.be/YkS1U5lfSRw The "gears" on this insect are basically intersecting teeth on two otherwise normal leg parts. Evolving an axle or any other free spinning part would require disconnected parts. The external parts would be cut off from any metabolic functions of the main body. Nothing remotely like that ha…

It seems to me this "impossibility" might be an artifact of definition: if some system contains disjoint parts, we no longer call it "an animal". Colonial animals are the edge case here. Most would be hesitant to say an ant colony is "an animal", but are happy to refer to a Portuguese Man 'o' War as such, despite also being a colony.

All members of a colonial animal are genetically identical, which I believe is why a man of war is an animal but an ant colony is a society. I don't think ants are genetically identical, although I'm not certain.

Man o Wars are also not disjoint. They have specialized cells, but I believe share nutrition among the non-feeding cells. A truly disjoint creature would need a metabolic system on both sides of the disjoint, a separate nervous system, and perhaps most difficult, a way to pass messages across the disjoint quickly enough to be useful (aka electric impulse).

At a certain point, I think it starts becoming dubious whether it's a single creature. Even if they're genetically identical, they start to look more like twins than a colonial creature.

Re: Insect Has Gears in Its Legs (2013)

#16

It seems to me there is still so much to learn from nature. Something that is impressive to me is how insects manage energy, tiny things moving or flying around and processing information for hours with I don't know what source and storage for it. I am obviously a total ignorant in physics and biology.

You might enjoy "There's plenty of room at the bottom" by Feynman.

Re: Insect Has Gears in Its Legs (2013)

#17

It seems to me there is still so much to learn from nature. Something that is impressive to me is how insects manage energy, tiny things moving or flying around and processing information for hours with I don't know what source and storage for it. I am obviously a total ignorant in physics and biology.

ATP synthase. It is a protein that has a stator like in a motor that rotates in phases when it combines ADP and phosphate to make ATP. Amazing.

I was coming to say the same thing. Here's a short animated video about it https://www.youtube.com/watch?v=kXpzp4RDGJI

Re: Insect Has Gears in Its Legs (2013)

#18

It seems to me there is still so much to learn from nature. Something that is impressive to me is how insects manage energy, tiny things moving or flying around and processing information for hours with I don't know what source and storage for it. I am obviously a total ignorant in physics and biology.

Actually it's the human bodies that are quite wasteful (so are humans themselves). Many big animals can keep going without food for months. And it's not just their oily fat reserves, they are much more efficient with energy.
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