"But the very fact that matter in the cosmos is still moving, rather than at rest, is the single most surprising thing…"

"But sometimes reality chooses not to conform to our preferences."

"It can't be stressed enough that the multiverse is utterly hypothetical—but that doesn't mean it isn't real."

"Even if we don't know the answer, a change of perspective can help us improve the question."

"In contrast to the arbitrarily complicated evolution of a (nonintegrable) classical system, all a quantum state ever …"

"The mystery of the arrow of time comes down to this: Why were the conditions in the early universe set up in a partic…"

"Inflation is a simple idea: imagine that the universe begins in a tiny patch of space dominated by the potential ener…"

"There probably are more forces than we know about, but they’re only going to be of direct interest to physicists, I’m…"

"All of my advice comes from remembering what I did wrong and then telling people not to do it. ... Don't wait to read…"

"When exactly does an observation occur? ... What were the laws of physics doing before there was anyone measuring thi…"