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By Ashley Strickland, CNN (CNN) — Ancient, fossilized teeth, uncovered during a decades-long archaeology project in northeastern Ethiopia, indicate that two different kinds of hominins, or human ancestors, lived in the same place between 2.6 million and 2.8 million years ago — and one of them may be a previously unknown species. The discovery provides

By Jacopo Prisco, CNN (CNN) — It stands to reason that a 95 million-year-old tooth shipped to my home would have a rich past. But what ensued after I bought it online for about $100 revealed how, for such relics and those who covet them, the present is in some ways much more complicated. I

By Laura Paddison, CNN (CNN) — Talks to finalize the world’s first treaty on plastic pollution in Geneva, Switzerland collapsed in failure Friday as countries remained bitterly divided how to tackle the crisis. The summit, held at the United Nations headquarters and attended by delegates from more than 180 countries, was supposed to end Thursday

By Anna Tunkova, CNN (CNN) — Bats have a bad reputation. Myths, folk tales, and negative media coverage mean people often link these flying mammals to vampires or blame them for disease outbreaks. But bat populations around the world are in decline, and without them, ecosystems lose key benefits like pest control, pollination and seed

By Andrew Freedman, CNN (CNN) — Satellites, including those used for GPS and communications, will face greater risks in coming decades during solar-triggered geomagnetic storms because of the effect climate pollution has on Earth’s atmosphere, a new study found. The increasing volume of planet-warming carbon dioxide in the upper atmosphere is likely to make the

By Ella Nilsen, CNN (CNN) — Time is running out for US consumers to get money back for rooftop solar installations, electric vehicles, energy efficient appliances and more after President Donald Trump and Republicans slashed clean energy out of the tax code last month. And the potential savings are steep. The federal tax credit alone

By Ashley Strickland, CNN (CNN) — The once-thriving Roman city of Pompeii resembles an eerie time capsule, seemingly unoccupied since a catastrophic volcanic eruption in AD 79, with the remains of its inhabitants forever frozen under a blanket of ash. But a closer look may reveal another bleak chapter in the tragedy’s aftermath, according to

By Ashley Strickland, CNN (CNN) — A rare Martian meteorite, billed as the largest piece of Mars on Earth, captured attention when it fetched millions from an anonymous bidder at a recent Sotheby’s auction. But the move has caused Niger, the country in West Africa where the space rock was initially found, to question the

By Lex Harvey, CNN (CNN) — From the rainforests of Central and South America to the savannas of northern Australia, the world’s equatorial regions are home to thousands of unique bird species, from macaws to toucans to hummingbirds, who thrive in hot and humid environments. But as climate change accelerates, tropical regions are seeing ten

By Taylor Nicioli (CNN) — For thousands of years, a disease repeatedly struck ancient Eurasia, quickly spreading far and wide. The bite of infected fleas that lived on rats passed on the plague in its most infamous form — the Black Death of the 14th century — to humans, and remains its most common form

By Laura Paddison, Luke Snyder, CNN (CNN) — Europe is on track for its worst wildfire season on record as swaths of the continent — including France, Spain, Albania, Portugal and Greece — battle raging, deadly fires as temperature soar above 100 degrees Fahrenheit. Wildfires are not unusual in Europe but the climate crisis is

By Gina Park, CNN (CNN) — It’s finally time to watch one of the best meteor showers of the year: the brilliant display known as the Perseids. The Perseid meteor shower, which is known for producing dozens of bright meteors that leave long streaks in their wake, peaked at 4 p.m. ET Tuesday. In previous

CNN By Gina Park, CNN (CNN) — It’s finally time to watch one of the best meteor showers of the year: the brilliant display known as the Perseids. The Perseid meteor shower, which is known for producing dozens of bright meteors that leave long streaks in their wake, peaked at 4 p.m. ET Tuesday. In

By Marlowe Starling, CNN (CNN) — Marine researchers exploring extreme depths say they have discovered an astonishing deep-sea ecosystem of chemosynthetic life that’s fueled by gases escaping from fractures in the ocean bed. The expedition revealed methane-producing microbes and marine invertebrates that make their home in unforgiving conditions where the sun’s rays don’t reach, according

By Taylor Nicioli, CNN (CNN) — The human genome is made up of 23 pairs of chromosomes, the biological blueprints that make humans … well, human. But it turns out that some of our DNA — about 8% — are the remnants of ancient viruses that embedded themselves into our genetic code over the course

By Ashley Strickland, CNN (CNN) — There’s a giant blob of incredibly hot rock beneath New Hampshire — and it may be part of the reason the Appalachian Mountains are still standing tall, according to new research. It has, however, been slowly moving and is on course for New York in the next 15 million

By Ella Nilsen, Andrew Freedman, CNN (CNN) — Dozens of veteran climate scientists are launching a coordinated response to a Trump administration report that casts doubt on the severity of climate change. The report, released last week alongside proposals to deregulate some polluting sectors, was authored by five researchers well-known for sowing doubt over the

By Ashley Strickland, CNN (CNN) — A new image has revealed the clearest glimpse yet of an interstellar visitor zipping through our solar system. The Hubble Telescope and its Wide Field Camera 3 got an incredible view of the comet named 3I/ATLAS, which came from beyond our solar system, on July 21 when the object