Sweethearts Candy may be gone this Valentine's Day, but that shape – you know the one! – is everywhere. The iconic symbol of love looks nothing like the human organ. Why? Blame Aristotle, or ...

Fifteen-thousand BCE, long before we had knowledge of what a human heart actually looked like, the earliest known depiction of a modern-day heart symbol was created in Spain within El Pindal Cave.

Rhythm comes in different forms from music and poetry to those inside our bodies. There's art based on the most primal rhythm of all: the beating of the human heart.