If proven correct, the discovery in an underground lab in central Japan by an international team of scientists would force a revision of a central theory of modern science and help solve the mystery of why the universe isn't as heavy as science says it should be.
Neutrinos are one of the basic building blocks of atoms and, in turn, everything else.
They are also particularly elusive. Neutrinos have no charge and are so small that they pass right through matter, making them very tricky to track. A team of 120 scientists working on a project known as the Super-Kamiokande Experiment, believe they have found evidence that proves that part of the theory needs to be reconsidered. While they can't measure a neutrino's mass, they have evidence that strongly suggests it has some. It is a huge step forward.