WONDER #682: Why Are There Revolving Doors?

Question 1 of 3

This Wonder was mostly about...

1. why revolving doors were invented and why they're used in so many buildings.
2. how to build your own revolving door.
3. why everyone should have a revolving door in their home.
4. how to make revolving doors spin faster.

Question 2 of 3

The door panels of revolving doors are often called what?

1. wings
2. leaves
3. sheaves
4. both (A) and (B)

Question 3 of 3

Which of the following is a benefit of revolving doors?

1. heating and cooling costs are minimized
2. street noise is reduced
3. sound of slamming doors is eliminated
4. all of the above

Check your answers online at https://wonderopolis.org/wonder/Why-Are-There-Revolving-Doors.