youcubed: What Would the Nautilus Say? (6-CC)
youcubed (Stanford University)

While the nautilus shell is often represented in popular culture as an example of a golden spiral, according to many mathematicians it is not.

youcubed: Unraveling Circles (K-12)
youcubed (Stanford University)

We use cylinders and circles around the house all the time like cans, tortillas, and rolls of paper towels, but what secrets do these shapes hold if we unravel them?

NRICH: Snail One Hundred
NRICH (University of Cambridge)

This is a game in which your counters move in a spiral round the snail’s shell. It is about understanding tens and units.