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RT @marinamaral2@twitter.com

In 1959, Ronald McNair (then aged 9) refused to leave a segregated library in South Carolina without being allowed to check out his books. Police were called.

In 1976, he got a Ph.D. degree from MIT.

In 1986, he was one of the astronauts aboard the space shuttle Challenger.

🐦🔗: twitter.com/marinamaral2/statu

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