Photo courtesy Karioi Rahui
Hanging mistletoe over a doorway during the Christmas holidays is a tradition that most Americans and a lot of people around the world have grown up with. But have you ever stopped to think about the story behind it? Where did it come from? Why do we kiss just because we're standing underneath some shrubbery?

In this edition of HowStuffWorks, you will find out about the plant called mistletoe, how it grows and how it is spread. You will learn about ancient people's understanding of biology and how they put it to use in their stories and myths. The next time you stand under the mistletoe, you will have a whole new understanding of this intriguing plant!