1 hour, 42 minutes ago BERLIN (AFP) - Khat, a plant whose leaves are chewed as a mild drug in East Africa and the Gulf, contains chemicals that may boost male fertility, an international conference was told. Called by its Latin name of Catha edulis, khat has been known for centuries for inducing a sense of euphoria and, say some of its champions, also improves a man's sex drive and ability to sustain an erection. The stimulant in the leaves is called cathinone, which is swiftly broken down by enzymes into cathine and norephedrine, part of a group of chemicals...