With the help of DNA and Egyptian tomb paintings, a long debate has been settled. Squeezed and sliced into fresh cocktails and salads, the bright pink juicy flesh of a watermelon is an iconic summer delight. But when it comes to understanding the exact origin of our domesticated watermelons, this is something that has puzzled scientists for a long time. That is, until now. Sweet and deadly Citrullus lanatus) is part of Citrullus, a genus that contains six other wild species, most of which can't be eaten raw due to the bitter tasting compounds cucurbitacins, which can also kill you.