Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Kissing an infection-free partner is good for your teeth!
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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You burn 26 calories in a one minute kiss.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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