"I don't want to give advice to people about their religious beliefs, but I do think that it's not sm..." — Sean M. Carroll

If time travel were possible, you still wouldn't be able to change the past - it's already happened!

The arrow of time doesn't move forward forever. There's a phase in the history of the universe where you go from low entropy to high entropy. But then, once you reach the locally maximum entropy you can get to, there's no more arrow of time.

A full understanding of what happens in our everyday lives needs to take into account what happened at the Big Bang. And not only is that intrinsically interesting and just kind of cool to think about, but it's also a mystery that is not given much attention by working scientists; it's a little bit underappreciated.