You can now be creative and turn a profit doing it.

Device creates negative mass and a novel way to generate lasers Most objects react in predictable ways when force is applied to themunless they have negative mass. Then they react exactly opposite from what you would expect. Nick Vamivakas, an associate professor of quantum optics and quantum physics, and other researchers in his lab have succeeded in creating particles with negative mass in an atomically thin semiconductor, by causing it to interact with confined light in an optical microcavity. This alone is interesting and exciting from a physics perspective, says Vamivakas. But it also turns out the device weve created presents a way to generate laser light with an incrementally small amount of power.