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Over the course of human history, thousands of languages have developed from what was once a much smaller number. How did we end up with so many? And how do we keep track of them all? Alex Gendler explains how linguists group languages into language families, demonstrating how these linguistic trees give us crucial insights into the past.

As the unofficial spokespeople for our organic-eating, Food Network-watching ways, when chefs talk, Americans tend to listen. And Dan Barber — the farm-to-table icon behind restaurants Blue Hill in New York City and Blue Hill Stone Barns in Tarrytown — isn’t wasting his platform.Barber has given a wildly popular TED talk, been counTED among TIME’s 100 most influential people, been appoinTED to the President’s Council on Fitness, Sports & Nutrition and, as of last week, authored a nearly 500-page book laying out a radical new vision for the future of food.So when Barber came out last weekend with a New York Times op-ed detailing the shortcomings of the farm-to-table movement he had previously helped promote, people paid attention. While we like to pat ourselves on the back for eating seasonally and locally, Barber’s contentious argument went, the foodie fad that grew to become the face of sustainable eating has failed to bring about the promised revolution. Industrial agriculture still rules, Barber argued. And as it keeps growing, more and more small farms and native prairie disappear under Big Ag’s plow.If we really care about changing our food system (as anyone who hopes to feed our growing world should), Barber believes we’re going to need a true revolution. And “The Third Plate“ is his thesis, over a decade in the works, for what that change must look like.Among other things, change means thinking holistically, embracing diversity in ingredient choice and cuisine, and shifting meat over from its vaulTED place at the center of the dinner plate. But while the solutions Barber describes are frighteningly extensive, they also, in his telling, sound delicious. That, more than any warning about the consequences of continuing along with the status quo, could be thing that ends up making a difference.

Would mathematics exist if people didn't? Did we create mathematical concepts to help us understand the world around us, or is math the native language of the universe itself? Jeff Dekofsky traces some famous arguments in this ancient and hotly debated question.

Nobel laureate and founder of behavioral economics Daniel Kahneman goes through a series of examples of things we might remember, from vacations to colonoscopies. He explains how our "experiencing selves" and our "remembering selves" perceive happiness differently.

There are people who can quickly memorize lists of thousands of numbers, the order of all the cards in a deck (or ten!), and much more. Science writer Joshua Foer describes the technique — called the memory palace — and shows off its most remarkable feature: anyone can learn how to use it, including him.

Optical illusions are images that seem to trick our minds into seeing something different from what they actually are. But how do they work? Nathan S. Jacobs walks us through a few common optical illusions and explains what these tricks of the eye can tell us about how our brains assemble visual information into the 3D world we see around us.