Strain energy from a rubber band can be used to make a car go.

See if you can go 1 foot - 12 inches
then two feet  24 inches
then 3 feet     36 inches.

Some times it can go very far.  What is 60 inches and 12 more inches?
 
 

Mrs. Withers wanted to have Leprechauns.

so they made some to ride on the cars.