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The Lawrence Livermore National Laboratory announced a key achievement in fusion research on Tuesday.

A laser light was focused onto a target the size of a BB which resulted in “a hot-spot the diameter of a human hair, generating more than 10 quadrillion watts of fusion power for 100 trillionths of a second,” a written statement says.

The development is being cheered by industry watchers, but there is still a long way to go before fusion will be commercially viable.