Ask 44,000 people to name a number and more choose seven than any other. It hides in our weeks, our myths, our rainbows and our fears. Here's why.
Every tap turns a new card — folklore, taboo, mathematics, the cosmos. There are more here than you'd think.
Tap the card to reveal your first secret of seven.
Named for the seven "wandering stars" the ancients could see in the sky.
Newton chose seven on purpose — to match the seven notes of music.
Pride, greed, lust, envy, gluttony, wrath, and sloth.
Of the ancient world — only the Great Pyramid of Giza still stands.
Sailors spoke of the seven seas long before any map had them.
Do, re, mi, fa, sol, la, ti — then it all begins again.
To be in "seventh heaven" is to reach the highest one of all.
You and a giraffe share this: almost every mammal has seven.
A perfect seven-sided polygon can't be drawn with only a compass and straightedge — the heptagon is the smallest regular shape that's simply impossible to construct that way.
Break a mirror and the curse lasts seven years — the Romans thought the body renewed every seven, so a shattered reflection wrecked a whole cycle of the self.
Divide 1 by 7 and you get 0.142857… forever. Multiply 142857 by 2, 3, 4, 5, or 6 and the very same digits reappear, just rotated. Mathematicians call it cyclic.