Neutrinos are some of the commonest particles in the universe.
Every second billions pass through our bodies.
However, they are also some of the
most elusive particles, rarely interacting or leaving any trace of their
The three types of neutrinos were believed to be distinct, being
produced and interacting in different ways, but recent results show that
they can transform in flight.
How do they do this?
How can we detect neutrinos at all?
And could their strange behaviour be responsible for the
very existence of a matter-filled universe?