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Kennedy's "'Everybody Stretches' Without Gravity: Mark Kelly Talks About NASA's Twins Study" on March 14, 2016 biology genetics longitudinal research NASA + twin biology genetics longitudinal research NASA twin
Emily Oster's "Don't take your vitamins" on January 12, 2015 causality covariate fivethirtyeight +4 health longitudinal research meta-analysis observational research preventative medicine replication research methods vitamins causality covariate fivethirtyeight health longitudinal research meta-analysis observational research preventative medicine replication research methods vitamins