'Shocking' die-off of Africa's oldest baobabs: study

Some of Africa's oldest and biggest baobab trees—a few dating all the way back to the ancient Greeks—have abruptly died, wholly or in part, in the past decade, researchers said Monday.

The strange case of the scuba-diving fly

More than a century ago, American writer Mark Twain observed a curious phenomenon at Mono Lake, just to the east of Yosemite National Park: enormous numbers of small flies would crawl underwater to forage and lay eggs, but ...

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