Amazon.com sales rank of Starr’s Guide to the John Muir Trail and the High Sierra Region: 83,755
Gear items required for Stanford’s Introduction to Wilderness Skills: 34
Percentage of U.S. college graduates who are “very afraid” of being alone in a forest: 7
Percentage who are very afraid of looking down from a great height: 23
Height, in feet, of Hoover Tower: 285
Height, in feet, of Herbert Hoover: 5.92
Sources: Amazon.com, Stanford University, Harris Poll, National Safety Council, Herbert Hoover Presidential Library Association
