Headline image caption and credit: An illustration suggests the behavior of big, complex molecules spreading out like ripples across space. © Yaakov Fein, Universität Wien The new experiment demonstrated a bizarre quantum effect from the double-slit experiment at an unprecedented scale. Giant molecules can be in two places at once, thanks to quantum physics. That's something that scientists have long known is theoretically true based on a few facts: Every particle or group of particles in the universe is also a wave — even large particles, even bacteria, even human beings, even planets and stars. And waves occupy multiple places in space at once. So any chunk of matter can also occupy two places at once. Physicists call this phenomenon "quantum superposition," and for decades, they have demonstrated it using small particles. But in recent years, physicists have scaled up their experiments, demonstrating quantum superposition using larger and larger particles. Now, in a paper published