Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more . CNN  —  Researchers have discovered the residues of psychedelic drugs, bodily fluids and alcohol inside a 2,000-year-old mug, suggesting that ancient Egyptians imbibed hallucinogenic beverages during rituals. It’s the first time scientists have been able to identify chemical signatures of the liquid concoctions sipped from mugs decorated with the head