Cocktail Hour: Gin and Tonic

Alcoholic drink gin tonic cocktail with lemon, rosemary and ice on rustic wooden table voloshin311 / Getty Images/iStockphoto

This simple, refreshing staple cocktail wouldn't be here if it weren't for heart disease and malaria. We trace the history of gin and tonic water, both separately and together, and explain the science behind why they're so darn tasty.