Beatrix Potter, the author of the beloved children's book "The Tale of Peter Rabbit", struggles for love, happiness and success.

Over 100 years ago, Albert Einstein grappled with the implications of his revolutionary special theory of relativity and came to a startling conclusion: mass and energy are one, related by the formula E = mc2. In "Einstein's Big Idea," NOVA dramatizes the remarkable story behind this equation. E = mc2 was just one of several extraordinary breakthroughs that Einstein made in 1905, including the completion of his special theory of relativity, his identification of proof that atoms exist, and his explanation of the nature of light, which would win him the Nobel Prize in Physics. Among Einstein's ideas, E = mc2 is by far the most famous. Yet how many people know what it really means? In a thought-provoking and engrossing docudrama, NOVA illuminates this deceptively simple formula by unraveling the story of how it came to be.

A nobleman with a literary flair, the Marquis de Sade lives in a madhouse where a beautiful laundry maid smuggles his erotic stories to a printer, defying orders from the asylum's resident priest. The titillating passages whip all of France into a sexual frenzy, until a fiercely conservative doctor tries to put an end to the fun.

The story of Col. Paul Tibbets and his crew who flew the Enola Gay, the plane that dropped the first atomic bomb on Hiroshima, bringing World War II to a close.