Answer:
During the 1800's these turned women into hourglasses and is becoming more popular again these days
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
This thing all things devours: Birds, beasts, trees, flowers; Gnaws iron, bites steel; Grinds hard stones to meal; Slays king, ruins town, And beats high mountains down.
What two things can always see what the other sees, but can never see each other?
We are five little objects of an everyday sort, You will find us all in a tennis court.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?