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Much of the heat within our planet is caused by the radioactive decay of the elements uranium and thorium. Now, an international team of particle physicists using a special detector in Japan has demonstrated a novel method of measuring that radioactive heat.

In the subatomic particle family, the neutrino is a bit like a wayward red-haired stepson. Neutrinos were long ago detected-and even longer ago predicted to exist-but everything physicists know about nuclear processes says there should be a certain number of neutrinos streaming from the sun, yet there are nowhere near enough.

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