Scientists have made a significant breakthrough in the field of nuclear fusion - for the first time they got more energy out of a fusion reaction than they put in.
The breakthrough is a major step in the quest to unlock a clean, safe, and almost limitless energy source.
A nuclear fusion reaction sees high powered lasers used to try and fuse two hydrogen elements together, releasing a huge amount of energy in the process, and harmless helium.
It's a process we know happens in stars, including our own sun, and temperatures within the reaction chamber reach a staggering 100 million degrees.
Otago University Physics Department research fellow Dr Jonathan Squire spoke to Kim Hill.
