Six and seven have been quietly running the universe for centuries. Here's the receipts.
6
Nature Every insect on Earth gets around on exactly six legs.
Geometry Bees build in hexagons — six sides is the most efficient shape for packing a space with zero gaps.
History Henry VIII got married six times. Divorced, beheaded, died, divorced, beheaded, survived.
Sport Ice hockey plays six-a-side, including the goalkeeper.
Idiom "Six degrees of separation" — the idea that any two people on the planet are connected by six or fewer introductions.
Everyday Eggs, beers, and doughnuts all come in sixes because it's the perfect grab-and-go number.
7
Calendar Every week, everywhere, has run on seven days for thousands of years.
Nature A rainbow is made of seven visible colours, from red to violet.
Music The standard major scale — do re mi fa so la ti — is built from seven notes.
History Ancient scholars listed the Seven Wonders of the World, and only one, the Great Pyramid of Giza, is still standing.
Sport Rugby sevens is played with seven players a side instead of the usual fifteen.
Culture Seven shows up as the "lucky number" across more cultures and games of chance than any other digit.
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