Caesar’s last breath

by Geoff Olson

Breathe in. Breathe out. Now consider this: every breath you take contains at least one air molecule exhaled by Julius Caesar in his last breath. With your every breath, at least one of these molecules makes its way into your lungs. This pop-science factoid may sound dubious, but it actually began as a thought experiment by nuclear physicist Enrico Fermi. It’s been a chem class standard ever since.

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