In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Historically, sweat has been an active ingredient in perfume and love potions.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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One in five long-term love relationships began with one or both partners being involved with others.
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Men who kiss their wives in the morning live five years longer than those who don't.
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