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"The only difference between brown eyes and every other colored eye is that brown eyes have more pigment."

"The only animals that can naturally sleep on their backs are humans. No other animal actually does--apes usually sleep sitting up and ...

"The military salute originated during the medieval times. Knights in armour used to raise their visors to reveal their identity, and t...

"The Shell Oil Company originally began as a novelty shop in London that sold seashells." The name Shell is linked t...

"Each nostril of a human being registers smells in a different way. Smells that are made from the right nostril are more pleasant than...