One of NASA’s greatest mathematicians, Katherine Johnson, has died 25 February, 2020 https://cdn.arstechnica.net/wp-content/uploads/2020/02/katherine_johnson_john_glenn-800×407.pnghttps://arstechnica.com/?p=1655817"Anything that could be counted, I did." Share this:TweetShare on TumblrLike this:Like Loading...