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Roughly 375 million years ago, a funny-looking fish named Tiktaalik ventured ashore using novel adaptations: lobed fins to propel itself to "walk" on land and air sacs in its throat to breathe oxygen from the air. Tiktaalik , which also had gills , is the earliest known common ancestor of tetrapods, or four-legged Animals . Over hundreds of millions of years, tetrapods evolved into countless species, including Homo sapiens . So, if humans evolved from fish, why don't we have gills? Part of the answer is practical: Gills need to stay wet in order to work, which isn't ideal for animals that don't live underwater. Gills have a large surface area and thousands of tiny blood vessels , giving oxygen easy access to the bloodstream. As water rushes over the gills, oxygen diffuses in and carbon dioxide diffuses out, said Chris Organ , an evolutionary biologist at Montana State University. If land animals had gills, they would quickly dry up, making it an inefficien...

The skull of an ancient human discovered in northeastern China may belong to a previously unknown human species that scientists have dubbed Homo longi , or "Dragon Man," three new studies report. Dragon man's well-preserved skull is the largest Homo skull on record. An analysis of the cranium revealed that Dragon man might be the closest-known related species to Homo sapiens , even closer than Neanderthals , who were long thought to be our closest relation, the study found. "I was surprised by the resulting phylogeny [family-tree analysis] linking it to H. sapiens rather than H. neanderthalensis , but our conclusions are based on the analysis of large amounts of data," study co-researcher Chris Stringer, a research leader at the Center for Human Evolution Research at the Natural History Museum in London, told Live Science in an email. However, this interpretation is debatable; it seems possible that this skull belongs to the mysterious Denisovan human li...

The Coast Guard says it has recovered remaining debris, including presumed human remains, from a submersible that imploded in June on its way to explore the wreck of the Titanic, killing all five onboard The Coast Guard has recovered remaining debris, including presumed human remains, from a submersible that imploded on its way to explore the wreck of the Titanic, killing all five onboard, deep beneath the Atlantic Ocean's surface, officials said Tuesday. The Coast Guard said that the recovery and transfer of remaining parts was completed last Wednesday, and a photo showed the intact aft titanium endcap of the 22-foot (6.7-meter) vessel. Additional presumed human remains were carefully recovered from within Titan’s debris and transported for analysis by U.S. medical professionals, the Coast Guard said. The salvage mission conducted under an agreement with the U.S. Navy was a follow-up to initial recovery operations on the ocean floor roughly 1,600 feet (488 meters) away from th...

John Ramirez, a former CIA officer with 25 years of experience, has been sharing the knowledge he gained on UAPs in the course of his work since 2021. He has a wealth of information and experience on the subject of UAPs and the US intelligence organization. Due to his revelations of UAP puzzles that had never been discussed in public by government officials, he established himself as an influential figure on social media. Among all his claims, the most surprising revelation is about the alleged human hybridization programs. He strongly believes that the 1947 Roswell accident occurred and that its non-human occupants were recovered. The recent tweet about retired CIA officer John Ramirez by investigative journalist Ross Coulthart has opened a new channel for discussing topics that were previously considered fringe. The UAP phenomenon is becoming more intense and mysterious with more credible sources bringing new information. Coulthart questions why...