Quantum entanglement is the eerie phenomenon where two particles can become so entwined that changing the properties of one will affect the other – no matter how far apart they are. In theory, they could be on opposite sides of the universe and still communicate instantaneously.

Quantum entanglement is the eerie phenomenon where two particles can become so entwined that changing the properties of one will affect the other – no matter how far apart they are. In theory, they could be on opposite sides of the universe and still communicate instantaneously.