Not all Christians celebrate Christmas. For example, Jehovah's Witnesses don't observe Christmas.
Answer: Luke and Matthew
It is the Gospels of Matthew and Luke that primarily deal with the Nativity.
The first known picture of a Christmas tree is from a pamphlet dating back to 1570.
Answer: Black Friday, the day after Thanksgiving
The day after Thanksgiving, known as "Black Friday", is considered the start of the Christmas shopping season.
KFC is very-popular in Japan around Christmas time, with customers sometimes making reservations two months in advance.
Answer: Brussel sprouts
Brussel sprouts are popular in the UK during Christmas.
Answer: Through the chimney
Santa Claus is said to descend down chimneys into homes.
Answer: Home Alone
"Home Alone" is based on the theme of a little boy outsmarting adult thieves in a Christmas setting.
Answer: Jingle Bells
Astronauts Tome Stafford and Wally Schirra sang "Jingle Bells" from space on 16 December 1965.