Flying saucers with lasers are real. Sort of.

Brighter lights and more accurate medical tests are foreseeable.

This computer-generated model shows the spherical core of the quantum dot nanoparticle (in red) along with the 'flying saucer' shape of the outer shell (in yellow). The tension in the core induced by the shell affects the electronic states and lowers the energy threshold required to trigger the laser. Credit: Dr. Alex Voznyy/U of T Engineering