Einstein's spooky action at a distance, between neurons. This is speculative, maybe recklessly so, but one possible interpretation is that these are neurotransmitters. The halves of the entangled pair float off and they bind to different receptors, and do their usual neurotransmitter thing of affecting how the neuron fires. But they are entangled, so theoretically the quantum state of one half could affect the other half and alter the chemical properties of the molecule that contains the other electron. Neurotransmitters signalling through a quantum communication channel. This effect would propagate at light speed, although the subsequent chemical side of it would not.
"Spooky action at a distance" propagates at faster than light speed.
That's why Einstein thought it was spooky! But in the widespread interpretation[1] of quantum entanglement it turns out not to be a problem because (while entanglement effects are real) it's impossible to transmit information or action via it.
Worth noting that this link doesn't talk about that at all. Instead it's about quantum chemistry effects.
