Tomorrow is January 28, and if you are old enough, you undoubtedly have a clear memory of exactly where you were 35 years agp, on January 28, 1986.

That was the day of that horrible tragedy, the explosion of Space Shuttle Challenger.

Among the crew members was teacher-astronaut Christa McAuliffe, who had won a nationwide competition to become the first teacher in space.

Watching the liftoff in person that day was Christa McAuliffe's mother, Grace George Corrigan.