...Nuclear fuel source.
There was a thorium reactor built by Oakridge labs back in the 1950s. The problem is that the government wanted to use uranium burning reactors instead, because the byproducts of a uranium burning reactor can be used to create a nuclear bomb.
So, once again our government was more interested than killing people then helping them out. This is why we don't use thorium today. Another advantage of a thorium reactor is the fact that thorium cannot easily be weaponized.
Scientists in India, China and the U.S. are all working on working prototypes currently. We're way behind in this regard however.
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