CIA @CIA
CIA developed the U-2 to fly at altitudes well above 63,000 feet, where human blood starts to bubble w/o artificial air pressure. Pilots wore an insulated pressure suit to protect them from depressurization during flight. Learn more: https://t.co/FgpEOZe4r9 #HISTINT #Museum https://t.co/bIIvdl0JYR — PolitiTweet.org