MathKnots representing numbers: The mathematics of the IncasManuel de Leon|Dec 20, 2022 - 21:31 CETQuechua civilization used knotted strings called ‘quipu’ to represent numerical values
19:35$3,000 and a plane ticket: The United States increases incentives for migrants to self-deport before the end of the year
18:38Charles Dubouloz, mountaineering star, retires at 36 with a farewell tour inspired by Walter Bonatti