Remembering Challenger 27 years later

16 of 22: Arlene Dressler, right, holds her 4-year-old daughter Beth Ellen during a memorial service for teacher Christa McAuliffe at St. John's Church in Concord, New Hampshire, Wednesday, Jan. 30, 1986. McAuliffe was killed in the explosion of the space shuttle Challenger. (AP Photo/ David Tenenbaum)

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