The most serious problem facing humankind is climate change.

Evolution is one of the most powerful and important ideas ever developed in the history of science. Every question it raises leads to new answers, new discoveries, and new smarter questions. The science of evolution is as expansive as nature itself. It is also the most meaningful creation story that humans have ever found.

You start doing the addictive behavior to feel good and then your receptors get overloaded with dopamine, then you stop doing the addictive thing and some of the receptors have shut down and you don't have enough dopamine to feel good. So then you feel bad and go back to the addictive behavior to get more dopamine. The strange thing is that it works with what we think of as uppers and downers and whatever you call gambling - sidewaysers.

I stand by my assertions that although you can know what happens to any individual species that you modify, you cannot be certain what will happen to the ecosystem. Also, we have a strange situation where we have malnourished fat people. It's not that we need more food. It's that we need to manage our food system better.

If we raise a generation of students who dont believe in the process of science, who think everything that weve come to know about nature and the universe can be dismissed by a few sentences translated into English from some ancient text, youre not going to continue to innovate.

I don't perceive an anti-religious agenda, especially with regard to Christians and Christianity. The issue being debated was creationism, the idea that the Earth is 6,000 years old. As I understand it, this involves the Bible's Old Testament exclusively.

When we see the shadow on our images, are we seeing the time 11 minutes ago on Mars? Or are we seeing the time on Mars as observed from Earth now? It's like time travel problems in science fiction. When is now; when was then?