Answer:
During the 1800's these turned women into hourglasses and is becoming more popular again these days
What has two spines and a lot of ribs, and carries much but never moves?
What flares up and does a lot of good, and when it dies is just a piece of wood?
The one who makes it, sells it. The one who buys it, never uses it. The one that uses it never knows that heβs using it.
I look at you, you look at me, I raise my right, you raise your left.
It rows quickly with four oars but never comes out from under his own roof. What is it?