Finding a cure for migraines is the dream of 37 million Americans who suffer regularly from these painful headaches. As one of humankind’s oldest afflictions, it dates back to the ancient Egyptians and 1200 BC. In 400 BC Hippocrates described migraine with aura and first recorded the relief sufferers could feel after vomiting. It took another 600 years, however, before Aretaeus of Cappadocia described the typical one-sided headache pain of a migraine, in tandem with vomiting and blocks of...