Commonly mistaken for a fruit, watermelons are actually vegetables that are part of the squash and cucumber family. The first watermelons, which originally grew in Africa, were mostly seeds and rind, while the watermelons eaten all over the world today are sweeter, larger and have thinner rinds.
Watermelons are made up of 8-percent sugar and 92-percent water. There are over 50 different varieties of watermelon today and not all of them contain seeds. Vegetables grow best in regions with warm weather and can be found in grocery stores all throughout the year. According to the Guinness Book of World Records, the largest watermelon in the world weighs 268.8 pounds and was grown in 2005 by a man named Lloyd Bright in Arkadelphia, Ark.