However, many UFO proponents believe the wreckage was of a crashed alien craft and that the military covered up the craft's recovery.Happily, every so often new discoveries leave the know-it-alls scraping egg off their faces, such as the identification of 'rocks from the sky' - meteorites - as genuine chunks of interplanetary matter, and the discovery of the 'extinct' coelacanth swimming happily in the Indian Ocean.According to tests on fossils found in Java, not one but three different human species co-existed on Earth around 35,000 years ago. There are widely divergent views on what actually happened and passionate debate about what evidence can be believed.
