A man has sparked a debate after sharing a video of a mysterious 'long object' moving across the sky above London. Sharing the 40-second clip on the UFO thread on Reddit, the man claims to have ...

Mysterious 'fast-moving objects' have been picked up underwater by the US Navy, weeks before the Pentagon's UFO report is to be made public. The sightings cannot be explained by experts or by current ...

Watch this video to learn more about friction. Find out about different types of friction and how we can increase or reduce it. Friction is a force between two surfaces rubbing against each other. If ...