Today, February 12, is the 200th birthday of two giants of the 19th century: Abraham Lincoln and Charles Darwin. That's right--they were born on the exact same day. There are two recent books that have discussed these two figures together, their similarities within their differences, so to speak. The most recent is just out: Adam Gopnik, Angels and Ages: A Short Book about Darwin, Lincoln, and Modern Life . Here is its description: On a memorable day in human history, February 12, 1809, two babies were born an ocean apart: Abraham Lincoln in a one-room Kentucky log cabin; Charles Darwin on an English country estate. It was a time of backward-seeming notions, when almost everyone still accepted the biblical account of creation as the literal truth and authoritarianism as the most natural and viable social order. But by the time both men died, the world had changed: ordinary people understood that life on earth was a story of continuous evolution, and the Civil War had proved tha...