Andreas Vesalius (1514–1564), an early European physician and professor of medicine, wrote an important treatise on the human body, published in 1543. He provided detailed illustrations that demonstrated muscle structure and other features of human anatomy, based on his work dissecting cadavers

Abraham Lincoln's interest in canal building, river commerce, and internal improvements not only drew him to the Whig and later Republican Party, but also led him to try his hand at designing a device for raising boats off sand bars. Undertaken while he was a 40-year-old lawyer in Illinois, Linco