'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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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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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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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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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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40% of people who are rejected in romantic love slip into clinical depression.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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