Before John Glenn orbited the Earth or Neil Armstrong walked on the moon, a group of dedicated female mathematicians known as "human computers" used pencils, slide rules, and adding machines to calculate the numbers that would launch rockets and astronauts into space. Among these problem solvers were a group of exceptionally talented African American women, some of the brightest minds of their generation.

The Roman Republic was one of the most remarkable achievements in the history of civilization. After its founding in 509 BCE, the Romans refused to allow a single leader to seize control of the state and grab absolute power. The Roman commitment to cooperative government and peaceful transfers of power was unmatched in the history of the ancient world. But by the year 133 BCE, the republican system was unable to cope with the vast empire Rome now ruled.

In 1912, at the height of World War I, brilliant Shakespeare expert Elizebeth Smith went to work for an eccentric tycoon on his estate outside Chicago. The tycoon had close ties to the US government, and he soon asked Elizebeth to apply her language skills to an exciting new venture: code breaking. There she met the man who would become her husband, groundbreaking cryptologist William Friedman. Though she and Friedman are in many ways the Adam and Eve of the NSA, Elizebeth's story, incredibly, has never been told.

We are familiar with maps that outline all 50 states. And we are also familiar with the idea that the United States is an "empire", exercising power around the world. But what about the actual territories - the islands, atolls, and archipelagos - this country has governed and inhabited? In How to Hide an Empire, author Daniel Immerwahr tells the fascinating story of the United States outside the United States. In crackling, fast-paced prose, he reveals forgotten episodes that cast American history in a new light.

Here at last is a history of England that is designed to entertain as well as inform and that will delight the armchair traveler, the tourist, or just about anyone interested in history. No people have engendered quite so much acclaim or earned so much censure as the English: extolled as the Athenians of modern times, yet hammered for their self-satisfaction and hypocrisy. But their history has been a spectacular one.

Recruited by the US Army and Navy from small towns and elite colleges, more than 10,000 women served as codebreakers during World War II. While their brothers and boyfriends took up arms, these women moved to Washington and learned the meticulous work of codebreaking. Their efforts shortened the war, saved countless lives, and gave them access to careers previously denied to them.

From the time of Ancient Sumeria, the heavy infantry phalanx dominated the battlefield. Armed with spears or pikes, standing shoulder to shoulder with shields interlocking, the men of the phalanx presented an impenetrable wall of wood and metal to the enemy. Until, that is, the Roman legion emerged to challenge them as masters of infantry battle.

Auckland Island is a godforsaken place in the middle of the Southern Ocean, 285 miles south of New Zealand. With year-round freezing rain and howling winds, it is one of the most forbidding places in the world. To be shipwrecked there means almost certain death. In 1864, Captain Thomas Musgrave and his crew of four aboard the schooner Grafton wreck on the southern end of the island. Utterly alone in a dense coastal forest, plagued by stinging blowflies and relentless rain, Captain Musgrave inspires his men to take action.

Twenty-five years after her passing, Audrey Hepburn remains the most beloved of all Hollywood stars, known as much for her role as UNICEF ambassador as for films like Roman Holiday and Breakfast at Tiffany's. Several biographies have chronicled her stardom, but none has covered her intense experiences through five years of Nazi occupation in the Netherlands. According to her son, Luca Dotti, "The war made my mother who she was."

The untold story of the most important rescue mission not just of the Vietnam War, but the entire Cold War: one American aviator who knew our most important secrets crashed behind enemy lines and was sought by the entire North Vietnamese and Russian military machines. One Navy SEAL and his Vietnamese partner had to sneak past them all to save him.