Flying cars are invent when future comes.We can travel faster than normal cars.But if it's smoke is black,it will pollute the air.I like the car smoke white.It can become clouds and give us more water to drink.
Anti-graviti skateboard sometimes invent at a few years or more.I know a little bit about that.The skateboard has a fast spinning fan that make wind under the skateboard so that it floats.I know that at a movie"Back to the future".
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