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By Issy Ronald, CNN (CNN) — When researcher Jared Towers set up his cameras underwater to observe a pair of killer whales, he saw something strange. One of the orcas, a juvenile female, “approached a camera I had in the water to film her younger brother and then opened her mouth and let out a

By Kameryn Griesser, CNN (CNN) — Hundreds of millions of flies dropping from planes in the sky might sound like a horrible nightmare, but experts say such a swarm could be the livestock industry’s best defense against a flesh-eating threat poised to invade the southwestern border of the United States. An outbreak of New World

By Katie Hunt, CNN (CNN) — A species of huge, flightless bird that once inhabited New Zealand disappeared around 600 years ago, shortly after human settlers first arrived on the country’s two main islands. Now, a Texas-based biotech company says it has a plan to bring it back. Genetic engineering startup Colossal Biosciences has added

By Olivia Kemp, CNN (CNN) — An ancient Peruvian city that was a thriving hub of trade more than 3,000 years ago has been unveiled by archaeologists. Peñico is located in the Huaura province, north of the capital Lima, according to the Ministry of Culture in a press release sent to CNN. In what was

By Jacopo Prisco, CNN (CNN) — A galaxy that has remained unchanged for 7 billion years — a rarity in the universe — has been observed by astronomers, offering a glimpse into cosmic history and adding to an enigmatic collection of objects called relics or “fossil galaxies.” These space oddities are galaxies that, after an

By Renée Rigdon, Angela Fritz, CNN (CNN) — The waterways in Texas Hill Country have carved paths over the centuries through the granite and limestone, shaping the rocky peaks and valleys that make the region so breathtaking. When too much rain falls for the ground to absorb, it runs downhill, pulled by gravity into streams,

By Andrew Freedman, Emma Tucker, Mary Gilbert, CNN (CNN) — The forces that descended upon the Guadalupe River in Texas’ Hill Country on Thursday night were a worst-case scenario. Four months’ worth of rain fell in just hours as water-laden thunderstorms stalled in place, giving rise to a wall of water that surged down the

By Katie Hunt, CNN (CNN) — Stone Age humans living by a lake in what’s now Germany systematically processed animal carcasses for fatty nutrients — essentially running what scientists describe as a “fat factory” to boil bones on a vast scale, according to new research. Archaeologists uncovered the factory by analyzing some 120,000 bone fragments

By Ashley Strickland, CNN (CNN) — A newly discovered object speeding through our solar system is sparking excitement among astronomers because it’s not from around here. Believed to be a comet, the object is only the third celestial body from beyond our solar system ever to be observed in our corner of the universe. This

By Ella Nilsen, Rene Marsh, CNN (CNN) — The Environmental Protection Agency has placed roughly 140 employees on administrative leave days after they signed a public letter expressing concern about the treatment of federal employees and the Trump administration’s regulations on climate and public health. The EPA is conducting an “administrative investigation” into the employees,

By Laura Paddison, Chris Liakos, CNN (CNN) — More than 200 firefighters are struggling to tackle an out-of-control wildfire on Crete — Greece’s largest island and a tourist hotspot — as authorities order mass evacuations. The fire broke out Wednesday afternoon near Ierapetra, a town on the island’s southeast coast, amid unusually high temperatures, 3

By Ella Nilsen, CNN (CNN) — The visitors who trek to America’s national parks are already noticing the changes, just months after President Donald Trump took office. “I’ve been visiting national parks for 30 years and never has the presence of rangers been so absent,” one visitor to Zion National Park wrote in National Parks

By Jack Guy, CNN (CNN) — A meteorite that is the largest known piece of Mars on Earth is expected to fetch up to $4 million. It’s up for auction at Sotheby’s. Known as NWA 16788, the meteorite weighs 54 pounds (24.5 kilograms), massive compared with most Martian meteorites, which tend to be small fragments,

By Laura Paddison, Mitchell McCluskey, CNN (CNN) — A brutal heat wave is gripping many parts of Europe, leaving millions of people struggling to adapt to punishing, record-breaking temperatures. Heat persists even at night, with temperatures in some places not dipping much below 90 degrees. There is little respite. Air conditioning is very rare in

By Laura Paddison, CNN (CNN) — Around 252 million years ago, life on Earth suffered its most catastrophic blow to date: a mass extinction event known as the “Great Dying” that wiped out around 90% of life. What followed has long puzzled scientists. The planet became lethally hot and remained so for 5 million years.

By Lianne Kolirin, CNN (CNN) — Crouched low in one of the coldest, remotest places on Earth, polar explorer Alan Chambers searched for an invisible threat. Traveling with fellow former Royal Marine Dave Thomas, he had spent two long months skiing 715 miles (1,151 kilometers) — completely unassisted — from the Hercules Inlet on the

By Andrew Freedman, CNN (CNN) — The Trump administration’s proposed budget seeks to shut down the laboratory atop a peak in Hawaii where scientists have gathered the most conclusive evidence of human-caused climate change since the 1950s. The Mauna Loa laboratory in Hawaii has measured atmospheric carbon dioxide, which — along with other planet-warming pollution