Free Republic

Sometimes what seems like a good idea at the time doesn't quite work out the way you pictured it. For example, when a firefighter in Spencerport, New York, was called in by a frantic owner to rescue a cat from a tree and all the usual methods like ladders drove the cat higher in the tree, he thought, "Wow, that's really high. There's got to be a better way." So, he got some people to stand under the tree with a blanket, and then cranked up the water cannon on top of the fire truck to spray the feline out....

Wigner sharpened the paradox by imagining a (human) friend of his shut in a lab, measuring a quantum system. He argued it was absurd to say his friend exists in a superposition of having seen and not seen a decay unless and until Wigner opens the lab door. [Nora] Tischler and her colleagues have carried out a version of the Wigner’s friend test. By combining the classic thought experiment with another quantum head-scratcher called entanglement—a phenomenon that links particles across vast distances—they have also derived a new theorem, which they claim puts the strongest constraints yet on the fundamental nature...