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Coconut crabs are a bird’s worst nightmare

Imagine you’re a red-footed booby napping on a not-quite-high-enough branch of a tree. It’s nighttime on an island in the middle of the Indian Ocean, and you can’t see much…

These disease-fighting bacteria produce echoes detectable by ultrasound

Ultrasound can now track bacteria in the body like sonar detects submarines. For the first time, researchers have genetically modified microbes to form gas-filled pouches that scatter sound waves to…