Matt Crawford speaks with author Candice Millard about her book, River of the Gods. The headwaters of the Nile River have been shrouded in mystery for millennia and considered by some the Holy Grail of exploration, enter Richard Burton and John Hanning Speke. Sent by the Royal Geographical Society to claim the prize for England these men would endure hardship beyond belief for years at a time. Temporary blindness, paralysis, violence and finally betrayal were just some of what these men had to overcome through multiple joint and separate expeditions. One common thread through it all was "The Gem of the party," Sidi Mubarak Bombay, a former slave who was even more amazing than these two larger than life men. So, who did discover the source of the Nile? Read the book and find out!