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Decades ago, amid fears of rapid population growth, a biologist and an economist made a bet about how many people the planet could sustain. Global population is now estimated to top 7.1 billion. So who won the famous bet?

Pressure cooker bombs have long been used in places such as Afghanistan and Pakistan because they are cheap, easy to build and inconspicuous. They rely on basic principles of physics to amplify their explosive power.

Some of the greatest summer food experiences take you outside — from shucking corn and barbecuing to spitting watermelon seeds. Chef Bill Smith says his favorite summer memories took place at picnic tables over messy bowls of his grandmother's crab stew.

Rachel Martin talks tennis and the Australian Open with Mike Pesca, host of Slate's "The Gist."

Can teaching kids impulse control, self-evaluation and focus actually help them do better in school? Parents are paying top dollar for executive function coaches.

Deep in the woods of New Hampshire, 20 inmates are engaged in a fierce chess tournament in a secluded prison. The prize may be just a paper certificate, but even then, winning means a lot.

The little box is for presidential public financing. At first, it was relatively popular, but now fewer people are checking the box — and more candidates are rejecting the funds.

Republican presidential debates are divided into two tiers, based on where candidates appear in the polls. The lower tier has dwindled to just four candidates in Wednesday night's debate.

The vote is illegitimate, Ukraine's leaders in Kiev and Western governments say. Separatist leaders say Sunday's referendum shows strong support for secession; recent surveys tell a different story.

The Olympic sport of curling is a combination of bowling, bocce ball, billiards and chess — all on ice, and with some sweeping involved. NPR's Tamara Keith spent some time learning how to curl, and put together this cheat sheet.