10. Wow! Signal:
When Jerry R. Ehman worked under the SETI Project of the Ohio Wesleyan University’s Perkins Observatory, he did not expect that he would be able to pick up a radio frequency supposedly coming from deep space. He was able to get a 72-second signal from the constellation Sagittarius and was never able to get it again. Up to this day no one is sure about the origin of the signal. It derived its name, however, from the “wow!” that Jerry wrote in the margin of the printout.
11. Aluminum Wedge of Aiud:
Back in 1974, a group of workers in Romania discovered three different objects 10 meters deep in a sand trench. Two of the items were prehistoric elephant bones that have been dated as old as 2.5 million years ago. The third object however, is an aluminum wedge that was found together with the ancient bones. This discovery dumbfounded most researchers, as aluminum was difficult to create even by 19th century standards. While some call it evidence of extraterrestrials, others are calling it a hoax. Whatever it is, we may never know.