Tale of Entangled Goats

In the last Torah portion, Metzorah, we learned about two entangled birds. This week, we learn about two entangled goats. I don’t know if these goats studied quantum mechanics but they can sure teach us a thing or two about quantum entanglement. Entanglement is one of the mysteries of quantum mechanics. On a macro level, entanglement is easy to understand. Imagine a coin sawn into two halves along the plane parallel to the face of the coin. One-half has only heads and the other only tails. Let’s send each of these halves to two people, Shimon and Reuven. If Shimon gets the half with the heads, he knows immediately that Reuven got the half with the tails even if Reuven didn’t yet open the envelope. In other words, the states (heads or tails) [...]