In the particle world, sometimes two is better than one. Take, for instance, electron pairs. When two electrons are bound together, they can glide through a material without friction, giving the material special superconducting properties. Such paired electrons, or Cooper pairs, are a kind of hybrid particle—a composite of two particles that behaves as one, with properties that are greater than the sum of its parts.
Click here for original story, Physicists detect a hybrid particle held together by uniquely intense ‘glue’
Source: Phys.org