Сегодня родился Иван Кулибин
On April 21, 1735 Ivan Kulibin was born. This is a famous Russian mechanic-inventor. Kulibin made a unique pocket watch with several melodies. For more than 30 years Kulibin managed mechanical masterful St. Petersburg academy of Sciences. Under his management various machines, astronomical, physical and navigation devices and tools have been created. Today any inventor in the CIS countries is often called Kulibin.