In this Friday, Feb. 10, 2017 photo, Clyde Sachtleben poses at the observatory that bears his name in Hastings, Neb. Clyde Sachtleben, 80, has vacated his familiar part-time role as J-Term astronomy teacher and made his retirement permanent after serving 41 years as full-time head of the physics department through 2001. (Amy Roh/The Hastings Tribune via AP)
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