Erdös published more than 1,500 papers and did mathematics 19 hours a day, even at 83 – "The 1st sign of senility is when a man forgets his theorems. The 2ns sign is when he forgets to zip up. The 3rd sign is when he forgets to zip down" pic.twitter.com/gsG231pINM
Le 4 novembre 1970, le Concorde atteignit Mach 2 (2 155 km/h, soit 555 m par seconde) qu'il maintint durant 53 minutes ! À cette vitesse, malgré une température extérieur de -60°, le nez du supersonique atteignit 127°, et l'avion s'allongea de 23 cm !https://t.co/1iLaQNJy3bpic.twitter.com/MyLOkXNihL
Map shows the first sitting US President to visit each country. Only in 1923 did a US president make it across the border to Canada. Panama was visited way earlier because of a certain waterway… Source: https://t.co/bhzMi7W5b0pic.twitter.com/7lyNTf9nFb
100 years ago this bizarre version of Europe was proposed by Austrian P.A. Maas as an attempt to create permanent peace in Europe by getting rid of traditional nation states. It's so mad it hurts my brain. Source: https://t.co/ETfP9vbbSDpic.twitter.com/NYI7wwujTI
