I would like a ticket to Shengang.

Researchers using a detector called Super-Kamiokande think they have observed the beasts changing their fundamental nature in a way not seen before.

But in 1998, experiments at Super- K established that at least one of the three types, or "flavors, " in which neutrinos come must have at least some mass.

The results were consistent with those of the earlier K2K experiment, which studied muon neutrinos fired from an accelerator at Japan's KEK laboratory.

The core of Super-Kamiokande is a tank in an old zinc mine. This tank (see above) holds 50, 000 tonnes of water.