When Conor Knighton set off to explore America's "best idea", he worried the whole thing could end up being his worst idea. A broken engagement and a broken heart had left him longing for a change of scenery, but the plan he'd cooked up in response had gone a bit overboard in that department: Over the course of a single year, Knighton would visit every national park in the country, from Acadia to Zion.

Kim Stanley Robinson first ventured into the Sierra Nevada mountains during the summer of 1973. He returned from that encounter a changed man, awed by a landscape that made him feel as if he were simultaneously strolling through an art museum and scrambling on a jungle gym like an energized child. He has returned to the mountains throughout his life—more than a hundred trips—and has gathered a vast store of knowledge about them. The High Sierra is his lavish celebration of this exceptional place.

In 1954, 63-year-old Maine farmer Annie Wilkins embarked on an impossible journey. She had no money and no family, she had just lost her farm, and her doctor had given her only two years to live. But Annie wanted to see the Pacific Ocean before she died. She ignored her doctor’s advice to move into the county charity home. Instead, she bought a cast-off brown gelding named Tarzan, donned men’s dungarees, and headed south in mid-November, hoping to beat the snow.

This best-selling, groundbreaking exploration of the Far North is a classic of natural history, anthropology, and travel writing.

As a Yale School of Medicine physician, the New York Times best-selling author of Every Patient Tells a Story, and an inspiration and adviser for the hit Fox TV drama, House, M.D., Lisa Sanders has seen it all. And yet, she is often confounded by the cases she describes in her column: unexpected collections of symptoms that she and other physicians struggle to diagnose. Dr. Sanders shows how making the right diagnosis requires expertise, painstaking procedure, and sometimes a little luck.

At 22, Cheryl Strayed thought she had lost everything. In the wake of her mother's death, her family scattered and her own marriage was soon destroyed. Four years later, with nothing more to lose, she made the most impulsive decision of her life: to hike the Pacific Crest Trail from the Mojave Desert through California and Oregon to Washington State - and to do it alone. She had no experience as a long-distance hiker, and the trail was little more than “an idea, vague and outlandish and full of promise.” But it was a promise of piecing back together a life that had come undone.

The real stories behind the scenery of America’s national parks. For 12 years, Andrea Lankford lived in the biggest, most impressive national parks in the world, working a job she loved. She chaperoned baby sea turtles on their journey to sea. She pursued bad guys on her galloping patrol horse. She jumped into rescue helicopters bound for the heart of the Grand Canyon. She won arguments with bears. She slept with a few too many rattlesnakes. Hell yeah, it was the best job in the world! Fortunately, Andrea survived it.

At the beginning of his memoir Life Lived Wild: Adventures at the Edge of the Map, Rick Ridgeway tells us that if you add up all his many expeditions, he’s spent over five years of his life sleeping in tents: “And most of that in small tents pitched in the world’s most remote regions.” It’s not a boast so much as an explanation. Whether at elevation or raising a family back at sea level, those years taught him, he writes, “to distinguish matters of consequence from matters of inconsequence.” He leaves it to his listeners to do the final sort of which is which.

Every one of us contains a billion times more atoms than all the grains of sand in the earth’s deserts. If you weigh 150 pounds, you’ve got enough carbon to make 25 pounds of charcoal, enough salt to fill a saltshaker, enough chlorine to disinfect several backyard swimming pools, and enough iron to forge a 3-inch nail. But how did these elements combine to make us human?

J. Robert Oppenheimer was one of the iconic figures of the 20th century, a brilliant physicist who led the effort to build the atomic bomb but later confronted the moral consequences of scientific progress. When he proposed international controls over atomic materials, opposed the development of the hydrogen bomb, and criticized plans for a nuclear war, his ideas were anathema to powerful advocates of a massive nuclear buildup during the anti-Communist hysteria of the early 1950s.

An enthralling account of a modern voyage of discovery as we meet the clever, social birds of prey called caracaras, which puzzled Darwin, fascinate modern-day falconers, and carry secrets of our planet's deep past in their family history.

America's national parks spring from an idea as radical as the Declaration of Independence: that the nation's most magnificent and sacred places should be preserved, not for royalty or the rich, but for everyone. In this evocative narrative, Ken Burns and Dayton Duncan delve into the history of the park idea.

In the summer after graduating from college, Suleika Jaouad was preparing, as they say in commencement speeches, to enter “the real world”. She had fallen in love and moved to Paris to pursue her dream of becoming a war correspondent. The real world she found, however, would take her into a very different kind of conflict zone. It started with an itch - first on her feet, then up her legs, like a thousand invisible mosquito bites. Then a trip to the doctor and, a few weeks shy of her 23rd birthday, a diagnosis: leukemia, with a 35 percent chance of survival.

In 2003, software engineer David Miller left his job, family, and friends to hike 2,172 miles of the Appalachian Trail. AWOL on the Appalachian Trail is Miller’s account of this thru-hike from Georgia to Maine. Listeners are treated to rich descriptions of the Appalachian Mountains, the isolation and reverie, the inspiration that fueled his quest, and the rewards of taking a less conventional path through life. While this book abounds with introspection and perseverance, it also provides useful passages about hiking gear and planning.

Forty-four-year-old Alice Holtzman is stuck in a dead-end job, bereft of family, and now reeling from the unexpected death of her husband. Alice has begun having panic attacks whenever she thinks about how her life hasn't turned out the way she dreamed. Even the beloved honeybees she raises in her spare time aren't helping her feel better these days.