Nolan Physics on Instagram: "Why does the mass become negative? Sounds impossible, right? But in physics, under certain exotic conditions, objects can actually behave as if they have negative mass. That means if you push it one way, it accelerates the opposite way the complete reverse of how we expect matter to act. This strange effect shows up in cutting-edge experiments with Bose Einstein condensates and other quantum systems, where particles don't follow our everyday rules. @jason_washington_