Learn with us online while the Exploratorium is temporarily closed. You can help us reopen—donate today.
Known as the "poison of kings" for its role in palace coups and the "king of poisons" for its effectiveness, arsenic is one of the world's most notorious poisons—yet it surrounds us in the natural world and has appeared in medical and cosmetic contexts for thousands of years. Investigate our complex relationship with the 33rd element with Ron Hipschman.