I’m not sure I follow. Aren’t entangled particles in superposition until they’re measured? That would mean we have no way of saying they behaved the same way, u

I’m not sure I follow. Aren’t entangled particles in superposition until they’re measured? That would mean we have no way of saying they behaved the same way, until we measure them — at which point the “spin” of the particles will be random and opposite. Also, “measurement” doesn’t have to mean “by a human”. Particles in effect “measure” each other when they collide — which is one theory as to why we don’t see quantum effects at a macro scale — there’s too much stuff colliding into each other, collapsing the wave function. A book that’s pretty fascinating in this regard is “Life at the Edge: The Coming Age of Quantum Biology”. It explores how birds navigate the magnetic field via quantum effects that we once thought couldn’t “survive” at a macro scale. Fascinating.