Welcome back to Mind Over Money. Not just because it's the fastest place to get news and expert analysis, but more so because it is a knowledge portal to just about everything that interests me, all in one place, all easily accessible from my phone. In any given moment, I can be witnessing live posts and interactions from experts across a dozen of what I call "communities of knowledge," from science, politics, education and economics to nutrition, fitness, psychology, and entrepreneurship. On any given day, I can also find a dozen knowledge rabbit holes to run down. Therein lies some danger in being distracted.

For his next book, Joseph LeDoux knew he had to go deep. He had to go back in time, way back, 3.5 billion years ago. The author of the seminal The Emotional Brain, followed by Synaptic Self and Anxious, sensed a missing element in those books on how brain anatomy and function shape human behavior and emotions. In his new book, The Deep History of Ourselves: The Four-Billion-Year Story of How We Got Our Conscious Brains, LeDoux takes readers back to the emergence of life on Earth to show what our protean brains today owe to the canny survival of Protozoa. "I started asking, 'How far back in evolution does the ability to detect and respond to danger go?'" he said to me in a recent interview at his home in New York City. LeDoux directs the Emotional Brain Institute at New York University. In his research and previous books, he has shown the human brain processes that detect and respond to danger differ from the conscious experiences of fear itself. "I felt I needed to understand more about this process," he said.

Alex Honnold has his own verb. "To honnold"--usually written as "honnolding"--is to stand in some high, precarious place with your back to the wall, looking straight into the abyss. The verb was inspired by photographs of Honnold in precisely that position on Thank God Ledge, located 1,800 feet off the deck in Yosemite National Park. Honnold side-shuffled across this narrow sill of stone, heels to the wall, toes touching the void, when, in 2008, he became the first rock climber ever to scale the sheer granite face of Half Dome alone and without a rope. Had he lost his balance, he would have fallen for 10 long seconds to his death on the ground far below. Honnold is history's greatest ever climber in the free solo style, meaning he ascends without a rope or protective equipment of any kind. Above about 50 feet, any fall would likely be lethal, which means that, on epic days of soloing, he might spend 12 or more hours in the Death Zone. On the hardest parts of some climbing routes, his fingers will have no more contact with the rock than most people have with the touchscreens of their phones, while his toes press down on edges as thin as sticks of gum. Just watching a video of Honnold climbing will trigger some degree of vertigo, heart palpitations, or nausea in most people, and that's if they can watch them at all. Even Honnold has said that his palms sweat when he watches himself on film. All of this has made Honnold the most famous climber in the world.

When Angelica Lim bakes macaroons, she has her own kitchen helper, Naoki. Her assistant is only good at the repetitive tasks, like sifting flour, but he makes the job more fun. Naoki is very cute, just under two feet tall. He's white, mostly, with blue highlights, and has speakers where his ears should be. The little round circle of a mouth that gives him a surprised expression is actually a camera, and his eyes are infrared receivers and transmitters. "I just love robots," said Lim in 2013, at the time a Ph.D. student in the Department of Intelligent Science and Technology at Kyoto University in Japan.

When Angelica Lim bakes macaroons, she has her own kitchen helper, Naoki. Her assistant is only good at the repetitive tasks, like sifting flour, but he makes the job more fun. Naoki is very cute, just under two feet tall. He's white, mostly, with blue highlights, and has speakers where his ears should be. The little round circle of a mouth that gives him a surprised expression is actually a camera, and his eyes are infrared receivers and transmitters. "I just love robots," says Lim, a Ph.D. student in the Department of Intelligent Science and Technology at Kyoto University in Japan.

Alex Honnold has his own verb. "To honnold"--usually written as "honnolding"--is to stand in some high, precarious place with your back to the wall, looking straight into the abyss. The verb was inspired by photographs of Honnold in precisely that position on Thank God Ledge, located 1,800 feet off the deck in Yosemite National Park. Honnold side-shuffled across this narrow sill of stone, heels to the wall, toes touching the void, when, in 2008, he became the first rock climber ever to scale the sheer granite face of Half Dome alone and without a rope. Had he lost his balance, he would have fallen for 10 long seconds to his death on the ground far below. Honnold is history's greatest ever climber in the free solo style, meaning he ascends without a rope or protective equipment of any kind. Above about 50 feet, any fall would likely be lethal, which means that, on epic days of soloing, he might spend 12 or more hours in the Death Zone. On the hardest parts of some climbing routes, his fingers will have no more contact with the rock than most people have with the touchscreens of their phones, while his toes press down on edges as thin as sticks of gum. Just watching a video of Honnold climbing will trigger some degree of vertigo, heart palpitations, or nausea in most people, and that's if they can watch them at all. Even Honnold has said that his palms sweat when he watches himself on film. All of this has made Honnold the most famous climber in the world.