Numberphile - For a limited time the sparkly “foil” version of our golden spiral T-Shirt is in stock again… US: https://teespring.com/en/NP-Seeds EU: https://teespring.com/en/NP-Seeds_EU | Facebook
Merchandise — Numberphile
DFTBA Records — New, from Numberphile, the Graham's Number shirt!...
Numberphile - Sporting this T-Shirt today. FUN FACT: Ron Graham himself occasionally wears one!!! http://store.dftba.com/products/grahams-number- shirt | Facebook