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What’s trending at Scientific American? Check out the latest stories, videos and podcasts that connect with our readers the most!       Shop our Summer Sale and get all the stories and all the insights plus save 25% on an Unlimited or Digital subscription to Scientific American. Claim Offer Most Popular Listen to the Astonishing 'Chirp' of Two Black Holes Merging Some of the most violent cosmic collisions occur silently in the vacuum of space, but with the right instrumental ears, we can still hear it happen. Here's how. Read more   This Gargantuan Bird Weighed as Much as a Sports Car The elephant bird was the heaviest bird to ever walk the earth. Also, its eggs were 150 times the size of a chicken egg and thick as a dinner plate. Listen Now   Why Dying People Often Experience a Burst of Lucidity New research shows surprising activity levels in dying brains and may help explain the sudden clarity many people with dementia experience near death. Read more   Colombia’s ‘Cocaine Hippo’ Population Is Even Bigger Than Scientists Thought The most comprehensive census yet of the hippos in Colombia that are descended from several imported by drug-cartel leader Pablo Escobar reveals that there could be twice as many of the invasive animals as previous estimates indicated. Read more   The Weirdest Particles in the Universe Neutrinos are bizarre and ubiquitous and may just break the rules of physics. Read more

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