About a month ago, the winner for the Nobel prize for physics was split amongst three physicists, John Clauser, Alain Aspect and Anton Zeilinger. As some people explain it, they have essentially “[overthrown] reality as we know it.”
For some context, physicist John Bell is contributed much to the study of quantum entanglement during his lifetime. He found that that quantum particles, when measured, spin either up or down, and the chances for either are completely random when measuring an individual particle. However, these particles are entangled and when measuring the corresponding particle, it will always spin in the opposite direction of the original particle. The issue arises when it was found that even if one particle was on one side of the solar system, and the entangled particle was on the other side, these particles would continue to retain these entangled properties when measured at the exact same time. The chances of this occurring out of pure chance is infinitely small which leads to the conclusion that these particles seemingly communicate with each other instantaneously, faster than light or anything else in our universe.
Scientists even considered hidden variables that exist within an imperceptible level of reality but this was mathematically disproven. Understanding these conclusions, scientists ultimately established that our universe is not locally real. As they define it and within this context, real means that objects have properties that are independent of us observing them, so the moon still exists even when nobody looks at it and local means that objects are only influenced by their surroundings and these influences cannot travel faster than light. Although this obviously conflicts with our daily experiences, the idea of local realism has been disproven and our understanding of the universe has only become more confusing.