Quantum mechanics

The question “What is real?” is inescapable if you study quantum mechanics.Photo illustration by Nikk / Flickr Quantum mechanics is more than a century old, but physicists still fight over what it means. Most of the hand wringing and knuckle cracking in their debates goes back to an assumption known as “realism.” This is the […]

Physicists know how to use quantum theory—your phone and computer give plenty of evidence of that. But knowing how to use it is a far cry from fully understanding the world the theory describes—or even what the various mathematical devices scientists use in the theory are supposed to mean. One such mathematical object, whose status […]

Several years ago, I attended a Buddhist retreat in which I was introduced to the idea of the “retinue,” a constellation of influential and supportive people whom one imagines in an enveloping cloud as one meditates. Mentors. I took the concept one step further and decided to create an actual photo montage that I could […]

Nautilus’ Ingenious this month, Alan Lightman, is a successful writer and physicist, and one of the very rare people to receive an appointment in both science and humanities at MIT*. He did his doctoral research at Caltech while Richard Feynman was a professor there. One day, Lightman was on hand to see the brilliant and […]

An illustration of wave interferenceSybille Yates via Shutterstock Though we can see in remarkably low-light conditions, humans aren’t quite sensitive enough to see individual photons—the particles that make up all types of light. In our day-to-day lives, we are so awash with light that its particle nature is just as masked as the atomic nature […]