ALBUQUERQUE, Aug. 15 (UPI) -- Inhabitants of North America a thousand years ago looked for a "caffeine buzz," drinking a strong "Black Drink" for ceremonial purposes, researchers say.
Beakers excavated from sites in southeastern Illinois were apparently used by members of the Cahokia tribal group for beverages made with Ilex vomitoria and Ilex cassine, two forms of the holly plant that have substantial amounts of caffeine and theobromine, scientists said.