Gravity is thought to originate from a peculiar quantum property of matter called tendency of motion. Restlessness is an innate property of mass, as Brownian motion shows. Nucleons are thought to be self-propelled particles changing direction due to gravitational information called G-information. The observation that stars, black holes and other cosmic structures are emitting huge quantities of neutrinos and that the same structures have the most gravitational effect in the universe make the neutrinos the best candidate as a carrier of G-information. A simple weighing experiment shows a decrease of the weight of a test object by 0.05% at 350-400 m distance from the core of a CANDU nuclear reactor. This weight anomaly can be explained by the fact that a horizontal flux of anti-neutrinos generated by the nuclear reactor provides G-information to a population of nucleons of the test body which otherwise would receive G-information only from the ground neutrinos.