There are times when the lure of extrinsic rewards also plays a key role. When Nobel Prize winners Watson and Crick were struggling to figure out the structure of DNA, they worked almost nonstop because they knew other research teams were on the verge of making the breakthrough as well. When Alexander Graham Bell was working on the telephone, he was acutely aware others were doing the same. As it turned out, Bell beat Elisha Gray, one of his contemporaries, to the patent office by just hours so his instincts were quite correct.