"For millennia the location of the Nile River's headwaters was shrouded in mystery. In the 19th century, ... European powers sent off waves of explorations intended to map the unknown corners of the globe-- and extend their colonial empires. Richard Burton and John Hanning Speke were sent by the Royal Geographical Society to claim the prize for England. Burton spoke twenty-nine languages, and was a decorated soldier ... Speke was a young aristocrat...