Nuclear Fusion is the opposite of Nuclear Fission
It can only happen at very high temperatures and releases a lot of energy.
Two light nuclei (e.g hydrogen) are used to combine and create a larger nucleus.
Fusion does not leave behind a lot of radioactive waste and using hydrogen is practical as there's lots of it about in the air.
However, no material can withstand the high temperatures so the nuclear fusion reactors are very hard to build.
You have to contain the hot hygroden in a magnetic field
Most people wish that the theory of 'cold fusion' was true because it means creating electricity, easily and cheaply at room temperature.
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