Before the discovery of quantum mechanics, the framework of physics was this: If you tell me how things are now, I can then use the laws of physics to calculate, and hence predict, how things will be later.

Cosmology is among the oldest subjects to captivate our species. And it’s no wonder. We’re storytellers, and what could be more grand than the story of creation?

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

Experimental evidence is the final arbiter of right and wrong.

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

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.

The idea that there could be other universes out there is really one that stretches the mind in a great way.