New Delhi, April 20 -- We were on a bus from Petra to Wadi Rum in Jordan. The rocky landscape gave way to sandy fields dotted with dark green that turned out to be thousands of watermelons. Our driver and guide, Salah, informed us that Wadi Rum was known for its watermelons and insisted we taste this local fruit before driving on. Each one weighed well over 10kg. Salah cut open a watermelon and the 20 of us in the bus had our fill of the juiciest and most fragrant fruit....