Rocks in Your Gas Tank
Environmentalists are counting on hydrogen to replace greenhouse gas producing gasoline in cars and trucks, because it’s colorless, odorless and its byproduct is water vapor. But hydrogen has such a small molecule that it can easily escape, making it hard to keep it inside your gas tank. Liquid hydrogen doesn’t escape as easily, but it needs to be kept cold, meaning your car would also have to be a refrigerator. NASA has come up with a solution: put rocks in your gas tank.
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