One in five long-term love relationships began with one or both partners being involved with others.
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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
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
Erotomania is a type of delusion in which the person believes another person is in love with him/her.
38
Sea otters hold hands while sleeping so they don’t drift away from each other.
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Couples' personalities converge over time to make partners more and more similar.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104