Pulitzer Prize-winning biographer Jon Meacham on the evolution of Abraham Lincoln's moral principles and political leadership -- and what the era of Lincoln can teach us about the state of our democracy today.
Mathematician and linguist John Derbyshire tells the story of Bernhard Riemann, whose 19th-century theory on prime numbers is one of the most famous unsolved mathematical hypotheses of all time.
- John Derbyshire Mathematician, linguist, and author
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