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UFO sightings and alien abductions, mystical experiences and psychic phenomena, the near-death and the out-of-body experience--millions of ordinary people aroun

Over the course of his thirty years of investigation into UFOs, including his own field research, photographic evidence, and meticulously compiled case studies,

The leading mind behind the mathematics of string theory discusses how geometry explains the universe we see. Illustrations.

In physics, the idea of extra spatial dimensions originates from Nordstöm’s 5-dimensional vector theory in 1914, followed by Kaluza-Klein theory in 1921, in

The universe has many secrets. It may hide additional dimensions of space other than the familier three we recognize. There might even be another universe adjac