One of the worlds most beloved and bestselling writers takes his ultimate journey -- into the most intriguing and intractable questions that science seeks to answer.. In A Walk in the Woods Bill Bryson trekked the Appalachian Trail -- well most of it. In In A Sunburned Country he confronted some of the most lethal wildlife Australia has to offer. Now in his biggest book he confronts his greatest challenge: to understand -- and if possible answer -- the oldest biggest questions we have posed abou