Schrödinger's kittens enter the classical world. Latest paper of Johannes Kofler and Caslav Brukner is discussed in Nature News
23. Nov 2007 — Theory shows how quantum weirdness could still be seen on a large scale.
The particles that make up the world obey the rules of quantum theory, allowing them to do counterintuitive things such as being in several different places or states at once, so why don’t we see this sort of bizarre behaviour in the world around us? The explanation commonly offered in physics textbooks is that quantum effects apply only at very small scales, and get smoothed away at the everyday scales we can perceive.