It’s possible to brush your teeth too aggressively. Doing so can wear down enamel and make teeth sensitive to hot and cold foods.
Goose bumps evolved to make our ancestors’ hair stand up, making them appear more threatening to predators.
Wisdom teeth serve no purpose. They’re left over from hundreds of thousands of years ago. As early humans’ brains grew bigger, it reduced space in the mouth, crowding out this third set of molars.
Scientists aren't exactly sure why we yawn, but it may help regulate body temperature.we all yawn in the morning for no reason why that happen?no one knows.
Humans are the only animals with chins.No other animals in the world have chins not even our close animal monkeys.
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