Here’s a good Ted video on Quantum Mechanics, specifically, Quantum Entanglement.
However, there are some things that you should keep in mind. I know that someone will say “sure I can tell if the cat is alive or not without opening the box. Just listen for the bomb.”. In the original thought experiment, there is a vial of poisonous gas, a Geiger counter, and a radioactive source. If the Geiger counter detects radiation, it will break the vial (killing the cat). After one hour, there is a 50% chance that this will happen. The bomb version is easier to understand, but you have to realize that you can’t detect if the bomb has exploded or not.
Also, for the entanglement to work, you have to set things up very carefully to make the entanglement happen. You can’t just grab 2 atoms and have them be entangled.