Underground eyes
Neutrinos interact so rarely with matter (every second more that 65 billion neutrinos from the Sun speed through every square centimetre of you, but in your lifetime only a few will interact within you) that detecting them requires huge experiments located deep underground. Clockwise from top left: the 10,000 photomultiplier tubes of the SNO detector in Canada. Image: Sudbury Neutrino Observatory; inside the SuperKamiokande detector in Japan. Image: Super-Kamiokande; the Cerenkov ring caused by a neutrino reaction in the MiniBooNE detector at Fermilab in the US. Image: Fermilab; and a mural on the walls of the MINOS cavern. Image: Fermilab.