Schrödinger's Tardigrade: Have Researchers Quantum-Entangled Hardy Critters?

Schrödinger's cat is a thought problem that involves putting a cat in a box that would fill with poison if a radioactive atom splits. According to quantum mechanics, such a split can be said to have happened only if observed. And consequently, the cat must also be considered neither dead nor alive until observed. [ABSTRACT FROM AUTHOR]