"A U.S. company says it is getting closer to putting prototype electric cars on the road that will be powered by the heavy-metal thorium.

Thorium is a naturally occurring, slightly radioactive rare-earth element discovered in 1828 by the Swedish chemist Jons Jakob Berzelius, who named it after Thor, the Norse god of thunder. It is found in small amounts in most rocks and soils, where it is about three times more abundant than uranium.


However, the use of thorium is controversial ..."

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