/u/ZombieAlpacaLips's posts in /r/askscience

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Many plastic materials are expected to last hundreds of years in a landfill. When it finally reaches a state where it's no longer plastic, what will be left?

4641 upvotes

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How much mixing is there between layers of the Earth? Is a molecule 4,000 km down ever going to reach the surface?

92 upvotes

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Do non-human animals have as much facial feature variation as humans?

50 upvotes

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Do animals generally mate with others near their same age the way humans do?

26 upvotes

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If you had mugshots of a billion people, would current computer technology be able to sort them by appearance?

8 upvotes

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It's fairly common to be born with extra fingers or toes. Are there other body parts that humans can have fully functioning extras, and if so how frequently does that occur?

7 upvotes

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Dams are extremely dangerous to people in the water near them. Are there obstacles (other than cost) to automatically detecting someone in the water and shutting down the water flow?

1 upvotes

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If I rub something into my skin like a lotion or oil, what does my body do with those calories?

1 upvotes

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My impression is that most fish and other water dwellers generally have less body fat than most land animals. Is this accurate? And if so, why?

1 upvotes

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Is the composition of air fairly consistent around the globe?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Many plastic materials are expected to last hundreds of years in a landfill. When it finally reaches a state where it's no longer plastic, what will be left?	4641
How much mixing is there between layers of the Earth? Is a molecule 4,000 km down ever going to reach the surface?	92
Do non-human animals have as much facial feature variation as humans?	50
Do animals generally mate with others near their same age the way humans do?	26
If you had mugshots of a billion people, would current computer technology be able to sort them by appearance?	8
It's fairly common to be born with extra fingers or toes. Are there other body parts that humans can have fully functioning extras, and if so how frequently does that occur?	7
Dams are extremely dangerous to people in the water near them. Are there obstacles (other than cost) to automatically detecting someone in the water and shutting down the water flow?	1
If I rub something into my skin like a lotion or oil, what does my body do with those calories?	1
My impression is that most fish and other water dwellers generally have less body fat than most land animals. Is this accurate? And if so, why?	1
Is the composition of air fairly consistent around the globe?	1