'Walden,' published in 1854, is a manual for solitude with a purpose.
Many people associate Henry David Thoreau with solitude in the outdoors. But Thoreau understood in the mid-1800s that there was no such thing as nature separate from humans.
Part of yoga's appeal is that it is seen as a mystical, ancient tradition. The truth is, the practice of yoga today is profoundly different from those ancient ways.
Only a few parts of Buddhism's much larger practice were transplanted into American soil in the late 19th century. Here's how Buddhism changed when it migrated.