In 1920, the US Postal Service said you could no longer mail this - what is it?

Women like them long, men like them short - what are they?

Almost 50% of Americans will do this in the kitchen when no one else is around - what is it?

If history repeats itself this holiday season, women are expected to do this 4 times more than men.

In the 1860's, these were known as Boneshakers. What do we call them today?