Why it is the best chapter: This is the strongest evidence for quantum biology. The authors interview Thorsten Ritz, the physicist who cracked the code. The PDF allows you to search for "cryptochrome" across the whole book to see how the idea appears elsewhere.

The crown jewel. Explains how light-harvesting complexes in bacteria and plants exploit quantum beats. The famous 2007 Engel et al. experiment is dissected.

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