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The skin, part of the integumentary system.

1 vote
1 answer
156 views

What is different between the pigment of giraffes and the pigment of flowers?

I saw this video created by Derek Muller and he says there that it is very unusual to evolutionary develop the colour of the skin without the pigment. … Is it an active job of the cells or skin cells are just full of colorful minerals? In case of giraffes: How does skin correct the shape of the spots? …
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  • 2,446
4 votes
1 answer
3k views

Why does UVA penetrate deeper than UVB, though it's weaker?

Even though UVA radiation ranges in longer wavelengths (315–400 nm) than UVB (280–315 nm) and thus is less energetic, UVA is able to penetrate deeper into the skin and even reach the dermis. …
Probably's user avatar
  • 2,446
5 votes
2 answers
4k views

Why do we like to touch fluffy things?

I read this article but it didn't explain much. Is the fact people like to cuddle pets with fur connected anyhow with our past when our ancestors had fur as well - and therefore could evolve an instic …
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