Henry David Thoreau was a famed naturalist, philosopher, and author who resided in Eastern Massachusetts from 1817 to 1862. He was also a leading abolitionist and advocator of civil disobedience in defiance of an unjust state. He is perhaps best known for his views on simple living uncluttered by overdevelopment embodied in his famous book Walden; or, Life in the Woods. As a naturalist, he made records for the flowering dates of a number of common plant species. Now, 150 years later, a team of biologists from Boston University (BU) have compared those flowering records with those of today. They found that the flowering date for 43 common species had moved up by an average of seven days since the time of Thoreau.