Ever wonder where the symbol for a heart came from? Obviously it doesn't look like the biological organ, so where did it come from?
An interesting book I'm reading, Alien Hand Syndrome, has an answer. It's the shape of the seed of the silphium or laserwort plant, which was used — get this — as 7th century B.C. to first century A.D. birth control (and abortifacient). People think of pharmaceutical contraceptives as a modern invention but the ancients had them too. Unfortunately the plant in question grew in only a narrow strip of land and defied cultivation; the lust of the world drove it to extinction. Deo gratias.
But I'm never going to look at the heart symbol the same way again.