What Does It Mean to Be Alive? copertina

What Does It Mean to Be Alive?

What Does It Mean to Be Alive?

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A rock sits still, a flame dances and grows, and a kitten purrs — but which of these is actually alive? This episode tackles the surprisingly tricky question of what separates living things from non-living things, walking through the key characteristics scientists look for: growth, reproduction, response to surroundings, use of energy, and cells. Along the way, some fascinating edge cases — like viruses and seeds — reveal just how much debate still surrounds the boundary between life and not-life.
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