Car Smarts: Hydrogen-powered Vehicles

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  • What percentage of the universe is made up of hydrogen?

    • Although there's little pure hydrogen on the Earth's surface, the universe we live in is made up of about 75 percent hydrogen.
    • Although there's little pure hydrogen on the Earth's surface, the universe we live in is made up of about 75 percent hydrogen.
    • Although there's little pure hydrogen on the Earth's surface, the universe we live in is made up of about 75 percent hydrogen.
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