Oftentimes, if you're talking to a seasoned interviewer who asks you a question, they may do a follow-up if they didn't quite get it. It's rare that they'll do a third or fourth or fifth or sixth follow-up, because there's an implicit, agreed-upon decorum that they move on. Kids don't necessarily move on if they don't get it.

My best teachers were not the ones who knew all the answers, but those who were deeply excited by questions they couldn't answer.

The revelation we've come to is that we can trust our memories of a past with lower, not higher, entropy only if the big bang - the process, event, or happening that brought the universe into existence - started off the universe in an extraordinarily special, highly ordered state of low entropy.

No matter how hard you try to teach your cat general relativity, you're going to fail.

I enjoy reading blogs, but am not interested in having my spurious thoughts out there.

The bottom line is that time travel is allowed by the laws of physics.

One of the wonders of science is that it is completely universal. It crosses national boundaries with total ease.