Ten yttrium atoms with entangled electron spins, as used to first create a time crystal. Although these atoms have quantum properties that are not wholly independent of one another, they are not in identically cloned quantum states to one another.
CHRIS MONROE, UNIVERSITY OF MARYLAND
One of the most fundamental rules of physics, undisputed since Einstein first laid it out in 1905, is that no information-carrying signal of any type can travel through the Universe faster than the speed of light. Particles, either massive or massless, are required for transmitting information from one location to another, and those particles are mandated to travel either below (for massive) or at (for massless) the speed of light, as governed by the rules of relativity.