When pigeons outnumber pigeonholes, some birds must double up. This obvious statement — and its inverse — have deep ...

US stocks plunge on opening as EU ‘finalising’ plan to hit back in trade war - US president describes sweeping tariffs as ...

The Kakeya set—named for its discoverer Sōichi Kakeya—was complicated by a subsequent mathematician named Abram Samoilovitch ...

Crows in a lab were able to distinguish shapes that exhibited right angles, parallel lines, and symmetry, suggesting that, like humans, they have a special ability to perceive geometric regularity.