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There are five types of science Christmas cards:
1. When will Santa arrive (Physics Christmas card).
Calculate the physics problem in the picture to find out how long it will take for Santa Claus to arrive.


2. Why the Red-Nosed Deer has a red nose (Genetics Christmas card):
Rudolph is the only deer with a red nose and has been teased by his friends.
This Christmas card solves the mystery of the red nose!

3. The Evolution of Santa Claus
Santa's ancestors were already carrying Santa's candies 100 years ago, when mankind was living with tools.
They were already carrying Santa's candies.
"Merry Christmas." - Homo sapiens

4. Christmas tree gas exchange
The Christmas tree is still busy exchanging gas at Christmas.

5. Dissecting Christmas flowers
The reddish colored bracts in Christmas flowers are bracts, not petals.