Shroedinger's cat: Shroedinger put up the idea of a cat in a box. Next to the cat would be a vial of poison that would break open and kill the cat. Stating that while the box was unopened you could not know whether the poison had opened or not thus not knowing what has happened to the cat. So theoretically the cat could be thought of both alive and dead.
Yep. Don't see the connection.
Schrodinger's cat said that if you put a vial of radioactive material that triggered poison in a box, the cat would be alive and dead at the same time because one can't know when or if the radioactive material breaks down, and one can't observe the cat dying. Obviously, the cat can't be alive or dead at the same time, which illustrates that you can't apply quantum phenomena, such as Heisenberg's uncertainty principle, on a macroscopic scale. You don't see the connection because you don't see the argument behind the thought experiment.