Confounding sources of neutrinos - from cosmic rays to nuclear reactions in the sun and our own nuclear plants-are wearilyfamiliarto huntersof "geoneutrinos" from within Earth (see main story). But to map goings-on inside Earth's mantle, we also need to rule out neutrinos from Earth's crust and core.rnThe crust is thin relative to the mantle, but its proximity to underground detectors means its geoneutrino signal can overwhelm the one from the mantle.
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