> even if there is a signal we can't find it Yet. Although I love the notion of "neutrino noise" there are always clever tricks. Twenty years ago I designed a

> even if there is a signal we can't find it Yet. Although I love the notion of "neutrino noise" there are always clever tricks. Twenty years ago I designed a reactor neutrino detector that suppressed the fireball neutron background using a variety of signal processing cuts, and we could actually tell when the reactor was on after a week or so of data collection despite the raw background being three or four orders of magnitude larger than the signal. I'm sure the people working on this have thought of the obvious (neutrinos from the sun have directionality and a particular spectral shape) but anyone familiar with the history of experimental physics won't say it's impossible to beat this limit. Just that it's a problem we haven't solved. Yet.