Quantum of fundamental forces such as gravitons, photons, etc. are all bosons. Photons and gravitons are thought to be massless; and neutrinos are nearly so. Particles on the light cone are photons, and more hypothetically, gravitons. Some examples of these particles are "virtual gravitons" and "virtual photons". However indirect evidence of gravitons can be inferred by gravitational waves. Pions, photons, and gravitons fall into these respective categories. Massive gravity describes an expanding universe with massive gravitons, which weakens gravity on large scales. The Quantum Bands enable their wearer to fly by manipulating gravitons. Ikaris can levitate himself by mentally manipulating gravitons around himself. Virtual gravitons have a spin of 2 and they represent the force of gravity. String theory predicts the existence of gravitons and their well-defined interactions. Most theories containing gravitons suffer from severe problems. The reason is the extremely low cross section for the interaction of gravitons with matter.