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The sight of someone in tears might make you feel concerned. But the smell of tears, researchers say, has a different effect. Apparently the tears sent a message that romance was off the table. This study offers some of the most recent evidence that people perceive all sorts of interesting things about one another through olfaction.

Airborne molecules that elicit a reaction in a member of the same species are called pheromones, and the most famous ones are potent aphrodisiacs, like androstenone and androstenol in the saliva of male boars. Researchers as well as fragrance companies have been hoping to find a human sex pheromone for decades, but so far the search has failed, says George Preti of the Monell Chemical Senses Center in Philadelphia.

Researchers asked women to rate the odors of T-shirts worn by different men. Women preferred men whose DNA was different enough from their own that it would increase the likelihood of producing with a robust immune system. Newborns preferentially scoot toward the scent of breasts. And adults can often tell by smell whether the person who produced perspiration was anxious or not. The search for human pheromones has been hampered by two obstacles. Second, nobody has been able to find the exact chemicals that cue people about anxiety, mating compatibility or breast milk.

This may be because researchers have traditionally analyzed aromatics from armpits. The fact is, any bodily fluid could potentially harbor pheromones, which is why Sobel studied tears of sadness. And who knows what als are lurking in tears of joy? Continue or Give a Gift.

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