The Hairy Ball Theorem revisited – a newer, shorter, proof

Once proved, mathematical theorems* tend to stay proved. Nevertheless, they can sometimes still be improved – say, by making them shorter. Take, for example proofs for The Hairy Ball Theorem. Mathematician Henri Poincaré first drew attention to the Hairy Ball Theorem in 1885 with his treatise ‘Sur les courbes définies par les équations différentielles (III)’ Journal de […]

Podcast 26: A look back at the 2014 Ig Nobel Prize winners (PART 1)

Trod-upon banana peels; deities in toast; late night psychopaths; cat hazards; dog alignment; really, really, really heavy marijuana users; fat people’s shoes; spearmint tea and hairy women; and someone who swallowed a fork — all these all turn up in this week’s Improbable Research podcast. Click on the “Venetian blinds” icon — at the lower right corner here […]