Video · The Dehn Invariant – Numberphile TwitterShare on Facebook0 331 250 views Numberphile - July 14, 2019 Science Numberphile More Videos The Weather Equation – Numberphile Science · 6 hours ago Calculating Pi with Skittles and Census Data – Numberphile Science · 4 days ago Feeling Grumpy about Pi Day – Numberphile Science · 5 days ago 3867632931 × 10^10001 +1 – Numberphile Science · February 16, 2026 3867632931 × 10^10001 +1 – Numberphile Science · February 16, 2026 The 15-Game – Numberphile Science · February 7, 2026 Tools of the Trade (for infinite sums) – Numberphile Science · February 3, 2026 A Fake Fields Medal – Numberphile Science · January 21, 2026