The famous Rostocker Pfeilstorch (arrow storck) from 1822 demonstrated that birds migrated away from Europe in winter to Africa rather than hibernating or changing form (!) in winter. Now common knowledge back then a theory in need of proof. Source: https://t.co/CbOLmySEH6pic.twitter.com/xcatQnWZmu
A transit map of all the primary roads of the Roman Empire, from 150 CE – an ancient network made instantly more understandable via a familiar format. pic.twitter.com/77ulIg06LP