SpookyFrank
A cheap source of teeth for aquarium gravel
Breakthrough in nuclear fusion could mean ‘near-limitless energy’
Researchers managed to release more energy than they put in: a positive gain known as ignition
www.theguardian.com
It is not possible for anything to be 'near limitless'. If there is a limit, even an arbitrarily large one, then you are infinitely far from limitless.
Also the 0.4MJ of 'free' energy actually cost 500MJ of electrical energy. The equivalent of consuming an entire sack of potatoes to produce one chip.