One of the most interesting properties of matter with negative mass is that if something collides with it it accelerates in the opposite direction of the incomi

One of the most interesting properties of matter with negative mass is that if something collides with it it accelerates in the opposite direction of the incoming object. https://en.m.wikipedia.org/wiki/Exotic_matter#Negative_mass https://en.m.wikipedia.org/wiki/Exotic_matter#Negative_mass