Science fact or science fiction?

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UFOs

are alien aircraft overhead?
An exploration of unidentified flying objects covering the history of UFOs, Roswell, alien abduction, Area 51, and other related topics.
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Cryptozoology

could unexplained creatures be real?
"Readers will examine the history of cryptozoology, Bigfoot, Yeti, the Loch Ness Monster, and more before deciding for themselves"--Provided by publisher.
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Ancient aliens

did historic contact happen?
"Ancient aliens: did historic contact happen? Readers will examine the history of alien sightings, architecture, Nazca Lines, UFOs, and more before deciding for themselves"--Provided by publisher.
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Time travel

is visiting the past and future possible?
An exploration of time travel covering the history of time travel, Project Pegasus, famous time travel literature, time slippage, the theory of relativity, and other related topics.
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ESP

does a sixth sense exist?
An exploration of extrasensory perception, covering mind reading, remote viewing, future seers, and other related topics.
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Artificial intelligence

can computers take over?
An exploration of artificial intelligence covering the history of artificial intelligence, leading scientists in the field, the Three Laws of robots, the singularity, and other related topics.
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