Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Parents receive 1 out of every 5 Valentines.
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Kissing an infection-free partner is good for your teeth!
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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Wearing red increases attraction.
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