NASA @NASA
What happens to the body during spaceflight? Find out during a @Reddit_AMA on Thursday at 4pm ET as experts share results from a study that compared astronaut @StationCDRKelly’s bodily functions to his earthbound twin brother Mark Kelly. Details: https://t.co/LjaDjV50ED https://t.co/jR2E1gyNoB — PolitiTweet.org