Get ready for a sleigh ride through science! Learn how the Doppler effect and redshift can help us measure the speed of Rudolph and Santa Claus.

For the first time in five decades, "Rudolph the Red-Nosed Reindeer" was broadcast on NBC rather than CBS, where its been shown since 1972. Even if you missed those showings, however, there are still other places to get your "Rudolph" fix before the calendar ticks over to Dec. 26.

Rudolph the Red-Nosed Reindeer was conceived for a purely Scrooge-like reason — to make money. Its creator, however, saw the Montgomery Ward marketing campaign as an opportunity to be as bold in

Johnny Marks wrote the beloved holiday song, as well as “Rockin’ Around the Christmas Tree.” But he felt pigeonholed by the success of “Rudolph.”