How do sharks smell a single drop of blood from over two miles away?

If smell is based off your nose reacting to particles, how do predators like sharks smell, for example, "a single drop of blood from over two miles away"?

The exact quote is a bit of a myth. Sharks can detect a blood at levels as low as one part per million. Say you have a two containers of 1m3 of water (1,000 litres or 220 gallons), and with 20* drops (1ml) of blood added to one of them -- then shark would be able to tell the difference.

Not the same as being able to detect blood from 2 miles away, but still impressive.

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