Perfect day for a 40-mile bike ride through history: Started in Waltham MA, on the banks of the Charles River, where industrial capitalism started in America (the first water-powered Mills in the US were here, then Lowell). Then biked to Walden Pond, near Thoreau's Cabin and onwards to Ralph Waldo Emerson's house. Proceeded to bike to the Revolutionary War battlefields of Lexington and Concord, then back home. Not bad for a Tuesday afternoon!