Caffeine has become a common ingredient in skin-care products, but why? What does it actually do, if anything?
Updated: 07/11/2019 12:38P
Franklin Veaux: Addictions are a byproduct of chemical warfare. Plants evolved chemicals like caffeine, opioids, nicotine, cocaine, and theobromine because they are chemical poisons that protect the plant from being eaten by pests. They work by
Updated: 11/23/2018 02:52P