In the past two decades, our understanding of the navigational and physiological feats that enable birds to cross immense oceans, fly above the highest mountains, or remain in unbroken flight for months at a stretch has exploded. What we’ve learned of these key migrations―how billions of birds circumnavigate the globe, flying tens of thousands of miles between hemispheres on an annual basis―is nothing short of extraordinary.

Bird migration entails almost unfathomable endurance, like a sparrow-sized sandpiper that will fly nonstop from Canada to Venezuela―the equivalent of running 126 consecutive marathons without food, water, or rest―avoiding dehydration by “drinking” moisture from its own muscles and organs, while orienting itself using the earth’s magnetic field through a form of quantum entanglement that made Einstein queasy. Crossing the Pacific Ocean in nine days of nonstop flight, as some birds do, leaves little time for sleep, but migrants can put half their brains to sleep for a few seconds at a time, alternating sides―and their reaction time actually improves.

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An inspiring look at young climate change activists who are changing the world

The world is facing a climate crisis like we’ve never seen before. And kids around the world are stepping up to raise awareness and try to save the planet. As people saw in the youth climate strike in September 2019, kids will not stay silent about this subject—they’re going to make a change. Meet 12 young activists from around the world who are speaking out and taking action against climate change. Learn about the work they do and the challenges they face, and discover how the future of our planet starts with each and every one of us.

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