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2211. A passionate kiss causes the same chemical reactions in the brain that skydiving and firing a gun do.

2212. The largest canines of any land animal belong to the hippopotamus. However, they use these canines only for battle or to fend off predators.

2213. Humans are bioluminescent, the light just isn’t perceptible to the human eye.

2214. When you sneeze, you die for a second.

2215. An eye exam or a sight test can detect diseases such as blood pressure and diabetes.

2216. Blind people often struggle with sleep because they have no perception of light. Their circadian rhythm (internal clock) lacks the ability to match up a night and day cycle.

2217. The strangers in your dreams aren’t strangers. You might know them personally, but you’ve seen everyone in your dreams before. Crazy, right? The brain can’t create people, so it uses registered faces.

2218. If it takes you less than five minutes to fall asleep, it’s likely that you’re sleep deprived.

2219. If you don't move for 15 minutes, you will fall asleep.

2220. Newborns sleep a total of 14 to 17 hours a day on an irregular schedule with periods of one to three hours spent awake.

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