A hallucination is a sensory perception of something that does not exist.

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Does a -9 dB room cause hallucinations?

Does being in an anechoic chamber cause hallucinations? According to several blogs (that likely copy each other), it does. The Orfield Laboratory in Minneapolis–Saint Paul, Minnesota, United States is ...
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Is there a correlation between coffee (or caffeine) and auditory hallucinations?

The news is full of claims today that 5 cups of coffee a day is enough to cause auditory hallucination. Professor Simon Crowe, of La Trobe University in Melbourne... ‘The combination of ...
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“La fée verte”: Is Absinthe hallucinogenic?

Absinthe is a distilled, alcoholic beverage, sometimes referred to as "la fée verte" (the green fairy). Absinthe was banned in many countries during the early 20th century: 1906 - Brazil and ...
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Did sailors mistake sea cows for mermaids?

I've heard theories that mermaid sightings were the result of sex-starved sailors mistaking manatees, dugongs or Steller's sea cows for beautiful women. History.com claims Columbus did this, "How I ...