Thank you, Leonard and Penny

In a book I am reading, the protagonist says, "Sometimes when you open the box, the cat is alive. Sometimes it's dead."

Leonard explained Schrodinger's Cat theory to Penny in an episode; otherwise when reading the main character's remark, I would have been like: "Whaaat? Where did a cat in a box come from? Did I miss something?" And then I would have been looking for previous mention of a cat in a box.

The Big Bang Theory

If Sheldon, Leonard and Raj had been PhDs in 1941, they would have become part of the Manhattan Project and relocated to Los Alamos. Can you imagine those three working on the first atomic bomb? Or, maybe a few Manhattan physicists were Sheldon, Leonard and Raj.