Biology
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![A trio of giraffes from the necks up against a cloudy sky backdrop.](https://www.popsci.com/wp-content/uploads/2021/03/17/J5U6HHQSQNHU5EZXUC6336EROU.jpg?w=675)
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Ask Us Anything: Why do humans stop growing?
![an illustrated man with a magnifying glass held up to his eye](https://www.popsci.com/wp-content/uploads/2021/05/05/AUA_color.jpg?w=686)
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Ask Us Anything: Why can’t we see more colors?
![wasp eating bug](https://www.popsci.com/wp-content/uploads/2021/05/03/wasp-5333179-scaled.jpg?w=675)
Animals
Wasps are the bee’s knees
![Why Can Humans See In Color?](https://www.popsci.com/wp-content/uploads/2019/03/18/THN2AB2QVS7RVAEGXZO7ZP6BM4.jpg?w=672)
Animals
Why Can Humans See In Color?
![Tim Enthoven illustration](https://www.popsci.com/wp-content/uploads/2020/11/24/23FQYHPIJVGTFFVFUX7HEIGEF4.jpg?w=675)
Animals
Why do cats purr?
![Big Q body parts](https://www.popsci.com/wp-content/uploads/2020/06/08/VL6JJ7FATVAR3GEKDKFQ22L3QE.jpg?w=800)
Biology