The best problems selected from over 25 years of the Problem of the Week at Macalester College.

A meditation on the beauty and meaning of numbers, exploring mathematical equations, describing some of the mathematical discoveries of the past millennia, and pondering philosophical questions about the relation of numbers to the universe.

Cyclogeography is about the bicycle in the cultural imagination and also a portrait of London as seen from the saddle. In the great tradition of the psychogeographers, Jon Day attempts to depart from the map and reclaim the streets of the city. Informed by several grinding years spent as a bicycle courier, he lifts the lid on the solitary life of the courier. Traveling the unmapped byways, shortcuts, and urban edgelands, couriers are the declining, invisible workforce of the city. The parcels they deliver keep things running. For those who survive the crushing toughness of the job, the bicycle can become what holds them together.

"Martijn Doolaard traded in the convenience of a car and the distractions of daily life for a cross-continental cycling journey: a biped adventure from Amsterdam to Singapore. Leaving behind repetitive routines, One Year on a Bike indulges in slow travel, the subtlety of a gradually changing landscape, and the lessons learned through travelling. Venturing through Eastern European fields of yellow rapeseed to the intimate hosting culture in Iran, One Year on a Bike is a vivid chronicle of what can happen when the norm is pointedly replaced by exceptional self-discoveries and beautiful sceneries. Doolaard shares the gear and knowledge that made his trip possible." -- Provided by publisher.

In the summer of 2010, brothers-in-law Marty and Jim embark on a cycling trip along the Great Allegheny Passage and C&O Canal, a 335-mile trek from their home in Pittsburgh, Pennsylvania to Jim's boyhood home in Washington, DC. Chance encounters with colorful local characters and other surprising escapades during five days on the trail make for nonstop laughs. As they travel through forests and along winding rivers, they experience the breathtaking scenery of western Pennsylvania, Maryland and West Virginia, exploring early American history while learning more about each other as well as themselves. This true story is for adventurers and cyclists as well as couch potatoes looking for a lighthearted take on friendship and some hilarious fun.

Can Marcel make the ride of his life? Marcel loves riding his bicycle, whether he's racing through the streets of his small town in France or making bread deliveries for his parents' bakery. He dreams of someday competing in the Tour de France, the greatest bicycle race. But ever since Germany's occupation of France began two years ago, in 1940, the race has been canceled. Now there are soldiers everywhere, interrupting Marcel's rides with checkpoints and questioning.Then Marcel learns two big secrets, and he realizes there are worse things about the war than a canceled race. When he later discovers that his friend's entire family is in imminent danger, Marcel knows he can help -- but it will involve taking a risky bicycle ride to pass along covert information. And when nothing ends up going according to plan, it's up to him to keep pedaling and think quickly... because his friend, her family, and his own future hang in the balance.