article_snippet.sent: The mystery of what appears to be a screw fixed inside a rock (pictured) has perplexed scientists .
article_snippet.sent: An object that appears to be a screw fixed inside a rock has captured the world's attention since An object that appears to be a screw fixed inside a rock was found in the 1990s, but the debate rages on about what An object that appears to be a screw fixed inside a rock really is.
article_snippet.sent: Russian researchers believe An object that appears to be a screw fixed inside a rock is 300 million years old, leading some people to claim that An object that appears to be a screw fixed inside a rock may be proof of a highly advanced lost human civilisation, or even the work of aliens.
article_snippet.sent: Russian researchers stumbled across the ‘screw’ after searching the Kaluga region after an asteroid strike occurred there, Ancient Code reported.
article_snippet.sent: The ‘screw’ measures an inch (2cm) long and was collected by a UFO and paranormal research team called the Kosmopoisk Group.
article_snippet.sent: The ‘screw’ measures an inch (2cm) long and was collected by a UFO and paranormal research team claim that the stone is between 300 and 320 million years old and after X-raying it, believe there is another hidden ‘screw’ inside the stone.
article_snippet.sent: the Kosmopoisk Group has not said what the screw is made of, or given any detailed information about the screw.
article_snippet.sent: Researchers have dated the unusual 'screw' to 300 million years old, leading some people to claim that it may be proof of a highly advanced lost human civilisation, or even the work of aliens (stock image)
article_snippet.sent: Researchers stumbled across the ‘screw’ after searching the Kaluga region after an asteroid strike occurred there. 
article_snippet.sent: The ‘screw’ measures an inch (2cm) long and was collected by a UFO and paranormal research team called the Kosmopoisk Group .
article_snippet.sent: More far-fetched theories include that the 'screw' is the remains of an ancient form of technology that proves aliens lived on Earth millions of years ago, or that our ancestors were far more advanced than our think.
article_snippet.sent: Lots of out-of-place artefacts have been reported, such as nails or even tools embedded in ancient stone. '
article_snippet.sent: It would be great to think we could find such ancient evidence of a spaceship visiting we so long ago, but we have to consider whether extra-terrestrial spacecraft builders would use screws in the construction of extra-terrestrial spacecraft builders craft.
highlights_snippet.sent: 'Screw' was found in a stone by UFO researchers in Kaluga region, Russia .
  
highlights_snippet.sent: The unusual object is said to be 300 million years old .
  