Part one. Grains and yeast : a mashup for the ages. 1. Beer, nature, and people ; 2. Beer in the ancient world ; 3. Innovation and an emerging industry ; 4. Beer-drinking cultures -- Part two. Elements of (almost) every brew. 5. Essential molecules ; 6. Water ; 7. Barley ; 8. Yeast ; 9. Hops -- Part three. The science of Gemütlichkeit. 10. Fermentation ; 11. Beer and the senses ; 12. Beer bellies ; 13. Beer and the brain -- Part four. Frontiers, old and new. 14. Beer phylogeny ; 15. The resurrection men ; 16. The future of brewing.