What happened when the wheel was invented?

What has many teeth, but cannot bite?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

How many times do a clock's hands overlap in a day ?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

No one wants to have it, but if one got it, he does not want to lose it. What is It?

What goes up but never comes down?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

You bought me for dinner but never eat me. What am I?