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Bytram (from IRC) writes:

[sub likely contains entire articles and possibly more, and probably needs a trimmin']

Scientists discover how to turn light into matter after 80-year quest [phys.org]:

All you have to do is to trap a coherent light-wave within a cavity with perfectly-reflecting walls. The stationary trapped wave then has no dynamic EM-energy: Only stationary EM energy, which is the same as rest mass: And voila! A matter-wave. For example, the stationary wave within a laser cavity is a matter-wave. Also the stationary-waves within a black-body cavity are matter-waves. Light waves are all moving with a speed c and therefore have only dynamic mass energy; no rest-mass energy. Therefore a light-wave cannot be weighed. But they can be weighed when trapped to form a stationary-wave which is a matter-wave since all its energy is then rest-mass energy.

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