Behind every alleged unidentified flying object sighting, every creepy alien story and every first-contact theory, there's a person. An earthling who believes a little — or a lot — in the idea that aliens have visited Earth or are trying to.

So who are all these people? Writer Sarah Scoles was interested in finding out, and it's the people behind the science, philosophy and conspiracy theories of UFOs who she focuses on in her book, "They Are Already Here: UFO Culture and Why We See Saucers."

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Belief in UFOs is currently at a high point, with a 2019 Gallup poll showing that 33% of Americans "believe that some UFO sightings over the years have in fact been alien spacecraft visiting Earth from other planets or galaxies." About 60% of Americans are skeptical and 7% aren't sure — but 16% of people who answered the poll said they have personally witnessed a UFO.

Why UFOs now?