Very roughly how many water molecules would you guess there are in a single cell? Within a couple of orders of magnitude? I got it quite wrong.
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I guessed off-hand “a billion” which I think was just my brain’s way of saying “wow, a really big number!” But it’s WAY too small.
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There’s a bunch of different numbers you can find on the web. Some of them are definitely way off. But there’s a wide range of values that seem reasonable (to me) because cells vary in size over several orders of magnitude.
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You can do a Fermi estimate based either on mass (which didn’t occur to me, but several tweeps did it that way!) or based on volume. https://en.wikipedia.org/wiki/Fermi_problem …
1:03 PM - 20 Aug 2018
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