1. People reportedly prefer blue toothbrushes over red ones.
2. Some people used to believe that kissing a donkey could relieve a toothache.
3. Scientists say that the best time to take a nap is between 1 pm and 2:30 pm. because that's when a dip in body temperature makes us feel sleepy.
4. Because the speed of the Earth's rotation changes over time, a day in the age of dinosaurs was just 23 hours long.
5. Hummingbirds' wings can beat 200 times a second.
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