People invented the wheel thousands of years ago, long before cars.
At first, wheels helped make pots and carry heavy loads. It is one of the most useful ideas people ever had.
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Wheels roll round and round so things move without dragging.
Skateboards have four little wheels underneath a wooden board.
A wheelbarrow has just one wheel to help carry heavy loads.
Roller skates let you glide along on wheels on your feet.
Shopping carts have wheels so they are easy to push around the shop.