Saline water flowed on Mars just 0.4 million years ago, while the world’s biggest Schrödinger’s cat was re-created in a crystal — here’s a look at last week’s science news. The largest Schrödinger’s cat Researchers have put a tiny flake of a sapphire crystal in a state of quantum superposition in which its atoms move in two directions at once. Weighting just 16 micrograms, this weird object is 100 trillion times the mass of the molecules previously put in so-called cat states. Cat state is a way to re-create Schrödinger’s idea of an imaginary feline, known for being alive and dead simultaneously.