The Borexino collaboration put out a new paper on geoneutrinos last week. Geoneutrinos are just the neutrinos left over from beta decays occurring within the Earth. They look for inverse beta decay events, which can be identified by looking for the signal of neutron absorption by hydrogen in the scintillator, which typically happens a few hundred microseconds after the primary event. The paper reports a spectrum of the initial scintillation signal (from an electron [neutrino] or positron [antineutrino]) for geoneutrinos and reactor neutrinos and then report an estimate of the total power output of uranium and thorium in the Earth. Interestingly, the value is actually quite close to the total power output from man-made sources.