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What It Means to Be Alive

A dog is alive and a rock isn’t — but what exactly are you going by? Five traits sort living from non-living, then we test them on the tricky cases: fire, seeds, viruses.

What you learn here

1. The Five Things We Look For
2. Neither Movement nor Size Is the Test
3. Alive vs. Came From Something Alive
4. At the Boundary: Viruses

4 lessons · Free · no sign-up needed