1: The Bermuda Triangle - ships and planes vanish without a trace.

2: Crop circles - intricate designs left overnight in crops.

3: The Voynich manuscript - an ancient, undecipherable text.

4: Ball lightning - glowing orbs that move unpredictably.

5: Placebo effect - belief that a treatment is working, even without active ingredients.

6: The Taos Hum - low-frequency noise heard in New Mexico.

7: Dark matter - invisible substance that makes up most of the universe.

8: The placebo effect - belief that a treatment is working, even without active ingredients.

9: The Taos Hum - low-frequency noise heard in New Mexico.

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