Billion-times more efficient nuclear fusion could be unlocked with low-frequency lasers
(interestingengineering.com)
Oh there are lasers big enough to cure everything. Well, the person doesn't worry about the disease and you can't get it. Yes the person does disintegrate in the process but they are working on it. No wait, they're done working on it. Anyway, anyone else needs curing? No? Its a laser miracle!
Anyway seriously, lasers are dangerous if the person using them does not known what they're doing. If that's you, stop.