book shop › A Hunter-Gatherer's Guide to the 21st Century: Evolution and the Challenges of Modern Life by Heather Heying A Hunter-Gatherer's Guide to the 21st Century: Evolution and the Challenges of Modern Life by Heather Heying $14.00 Portfolio, 14-Sep-21. 320 pp. Add To Cart Added! Portfolio, 14-Sep-21. 320 pp.