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The depths of the valleys on a key act like a code that must match the lock. Robin Smith/The Image Bank via Getty Images

How do keys open locks?

Twitter will soon be without the benefits – and problems – of a public board of directors. A-Digit/DigitalVision Vectors via Getty Images

Elon Musk won’t have a board to watch him when he takes Twitter private – does that matter?

Musk’s tweets badgering Twitter’s board raised important corporate governance questions about a board’s purpose and whether its members should own shares in the company they oversee.
Fresh grizzly bear tracks in Yellowstone National Park. Jacob W. Frank, NPS/Flickr

Linking protected areas from Yellowstone to the Yukon shows the value of conserving large landscapes, not just isolated parks and preserves

Parks and refuges are important for conservation, but without connections, they’re like islands. Linking them by protecting land in between makes it possible for wildlife to move over bigger areas.
By pairing solar power and battery storage, hybrids can keep providing electricity after dark. Petmal via Getty Images

Meet the power plant of the future: Solar + battery hybrids are poised for explosive growth

The largest category of power plants applying to connect to the US grid are now solar, and over a third of those are hybrids that include battery storage.
Tourists cross a hanging bridge in the treetops of Costa Rica’s Monteverde cloud forest. Matthew Williams-Ellis/Universal Images Group via Getty Images

Protecting biodiversity – and making it accessible – has paid off for Costa Rica

Tourism revenues account for almost 10% of Costa Rica’s gross domestic product. New research shows that charismatic wildlife is necessary but not sufficient to attract ecotourists.

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