Russia 🇷🇺 @Russia
#OTD in 1754, 🇷🇺 Mikhail #Lomonosov reported the invention of an "aerodynamic machine" - prototype of a #helicopter! 🚁 Its rotors driven by a clock spring rotated in opposite directions. Centuries later, this principle would lift tons of cargo into the air! #RussiansDidItFirst https://t.co/qIAEOjFSmZ — PolitiTweet.org