· Blushing: Even Darwin struggled to explain why we would evolve a response that lets others know that we have cheated or lied.
· Laughter: The discovery that laughter is more often produced at banal comments than jokes prompts the question, why did it evolve?
· Pubic Hair: Scent radiator, warmth provider, or chafe protection? The answer to why humans have clumps of hair in private places is still open for debate.
· Teenagers: Even our closest relatives, the great apes, move smoothly from their juvenile to adult life phases – so why do humans spend an agonizing decade as teenagers?
· Dreams: Today, most researchers reject Freud's belief that dreams are expressions of our unconscious desires – but if that's the case, what are they for?
· Altruism: People still debate whether humans are genuinely altruistic by nature, but if we are, most agree it doesn't make evolutionary sense (survival of the fittest, right?)
· Art: Sexual display, learning tool or form of social glue? Why humans need Art?
· Superstition: Many of us have superstitions – odd, reassuring habits that make no rational sense – but there may be an underlying reason for such behavior. Or not.
· Kissing: The urge to kiss is not brought about by genes, so why do we find it so pleasurable to share saliva?
· Nose picking: Many of us do it, but eating bogeys offers little nutritional reward – could there be a health reason for the unappealing habit?
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