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Episode Synopsis

Why do the “constants of nature” — masses of subatomic particles and strengths of forces like gravity and electromagnetism — have the values they do? Does fine-tuning “cry out” for explanation?

Episode Segments

1. Bernard Carr
2. Luke Barnes
3. Geraint Lewis
4. George F. R. Ellis
5. Abraham Loeb

What's Fine-Tuning in Physics?

Discussion