## Spiral Challenge — Continuous Everywhere but Differentiable Nowhere

Megan Schmidt is obsessed with spirals. Her obsession got me hooked — for hours — on a math problem. I thought it would take maybe an hour or two, but I’m still at it and I’ve probably been working four or five hours. I’ve been having so much fun with it. Here’s the problem. Look at the […] via Spiral Challenge — Continuous Everywhere but Differentiable Nowhere