Gravity measured on the smallest scale ever

Physicists have measured the infinitesimal gravitational force between two tiny gold spheres, each about the size of a sesame seed, separated by a few millimetres. Researchers reduced interference by using a Faraday shield between the masses, and the experiment was performed in a vacuum during the least seismically active time of year. The work could pave the way to a better understanding of fundamental interactions and the quantum nature of gravity.