What is the mass of the question mark?

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    Exhibit at the CERN visitor's center showing the different particle families (in this case the electron family). Masses are shown by 'size' - it is not clear whether this is by radius or volume. Even worse, the unknown mass of the neutrino, likely almost or exactly zero, is shown by a big question mark that looks heavier than all the other particles.

    1. Todd Huffman ages ago | reply

      Since the question mark, as I see it, is in photons, the mass is obviously zero.

    2. Ronen M ages ago | reply

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