"While spacewalking | realized something, I used to think I was scared of heights but now I know I was just scared of gravity." - NASA astronaut Reid Wiseman https://t.co/JfrLEtdXIj https://video.twimg.com/amplify_video/1786833935214784512/vid/avc1/662x878/lF46qXQbqFvyeSrH.mp4?tag=14