Current psychological priesthoods ignore the fact that the profession of psychology was originated by Gustav Theodor Fechner, a physicist who recognized that the key to understanding human nature was the relationship between external stimuli and the brain.

The United States has a long tradition of preserving the all-American outdoor experience, dating back to the days of President Theodore Roosevelt.

When I began work on my first book, 'The River of Doubt,' which tells the story of Theodore Roosevelt's 1914 descent of an unmapped river in the Amazon rainforest, I thought of it as a tale of adventure, exploration and extraordinary courage.