In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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Couples' personalities converge over time to make partners more and more similar.
235
Historically, sweat has been an active ingredient in perfume and love potions.
309
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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The single biggest predictor of love is proximity.
30
40% of people who are rejected in romantic love slip into clinical depression.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25