In particle collider experiments, the new entanglement allowed scientists to peer inside atomic nuclei in more detail than ever before.

Pairs of particles can become so entwined with each other that one can no longer be described without the other, no matter how far apart they may be. Weirder still, changing one will instantly trigger a change in its partner, even if it was on the other side of the universe. The idea, known as quantum entanglement, sounds impossible to us, grounded as we are in the realm of classical physics. Even Einstein was unnerved by it, referring to it as "spooky action at a distance." However, decades of experiments have consistently backed it up, and it forms the basis of emerging technologies like quantum computers and networks.