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Poeple walk across the Big Four Bridge as the sun sets at Waterfront Park on June 22 in Louisville

Heat waves are getting more dangerous with climate change — and we may still be underestimating them

By Andrew Freedman, CNN (CNN) — The intensifying and expansive heat wave affecting around 150 million people in the United States from Wisconsin to Washington, DC, bears the hallmarks of human-caused global warming. Hundreds of daily temperature records are threatened during the next few days, particularly along the East Coast, and some all-time June high

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This image shows a small section of NSF-DOE Vera C. Rubin Observatory's total view of the Virgo cluster of galaxies

First images from the largest camera ever built reveal millions of galaxies

By Ashley Strickland, CNN (CNN) — The first test images from a groundbreaking observatory named for trailblazing astronomer Vera Rubin have captured the light from millions of distant stars and galaxies on an unprecedented scale and revealed thousands of previously unseen asteroids. While the National Science Foundation initially released only a couple of images and

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The nearly complete cranium recovered from a well in Harbin

Science recap: This week’s discoveries include new clues from the fossil skull of a mysterious human species

By Jackie Wattles, CNN (CNN) — Tens of thousands of years ago, our species — Homo sapiens — mingled and interbred with other prehistoric humans: our distant cousins, the Neanderthals and Denisovans. Hundreds of Neanderthal fossils give us a good idea of their appearance, lives and relationships, but so little is known about Denisovans that

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NASA’s Antarctic Impulsive Transient Antenna

Strange signals detected from Antarctic ice seem to defy laws of physics. Scientists are searching for an answer

By Ashley Strickland, CNN (CNN) — Scientists are trying to solve a decade-long mystery by determining the identity of anomalous signals detected from below ice in Antarctica. The strange radio waves emerged during a search for another unusual phenomenon: high-energy cosmic particles known as neutrinos. Arriving at Earth from the far reaches of the cosmos,

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An iron and steel works factory in England in 1880.

Scientists looked back in time to find the first signs of human-caused global warming. It’s far earlier than previously thought

By Andrew Freedman, CNN (CNN) — The human fingerprint on global warming was likely evident in Earth’s atmosphere far earlier than previously thought—even before the invention of modern cars, a new study says. Using a combination of scientific theory, modern observations and multiple, sophisticated computer models, researchers found a clear signal of human-caused climate change

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