/u/ryan-a's posts in /r/askscience

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What are the oldest species that we could (in theory) bring back from extinction, given the half-life of DNA?

1089 upvotes

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How do sharks smell blood 0.4km away? Does a particle of blood travel to their nose through the water?

1077 upvotes

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Is Pluto small enough that you could obviously see the curvature of the horizon while standing on the surface?

18 upvotes

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How have some species, e.g. tuatara, gone so long without evolving?

6 upvotes

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What speed would an aircraft headed west have to be doing in order to 'keep up with The Sun'?

3 upvotes

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Why do many Middle Eastern countries have the highest carbon dioxide emissions per capita?

2 upvotes

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What happens when you wind yourself?

1 upvotes

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Does a single cell on the tip of my finger contain all the genetic instructions for my entire body?

1 upvotes

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What is the minimum speed an already airborne aircraft can travel without falling out of the sky?

1 upvotes

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What causes the stinging feeling in your nose when you well up but attempt to hold back the tears?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What are the oldest species that we could (in theory) bring back from extinction, given the half-life of DNA?	1089
How do sharks smell blood 0.4km away? Does a particle of blood travel to their nose through the water?	1077
Is Pluto small enough that you could obviously see the curvature of the horizon while standing on the surface?	18
How have some species, e.g. tuatara, gone so long without evolving?	6
What speed would an aircraft headed west have to be doing in order to 'keep up with The Sun'?	3
Why do many Middle Eastern countries have the highest carbon dioxide emissions per capita?	2
What happens when you wind yourself?	1
Does a single cell on the tip of my finger contain all the genetic instructions for my entire body?	1
What is the minimum speed an already airborne aircraft can travel without falling out of the sky?	1
What causes the stinging feeling in your nose when you well up but attempt to hold back the tears?	1