Traditional Brazilian healers who used indigenous mint to relieve headaches and stomach pain were onto something, say researchers who found the mint tea is as effective a pain reliever as aspirin-type medication. But this isn't just any mint tea: The leaves of a Brazilian mint variety are boiled for 30 minutes and cooled into a strong drink. The sage-like taste, a researcher tells the BBC, is "not that nice, really, but then medicine isn't supposed to be nice, is it?" (More mint stories.)