There is little evidence that our individual intelligence has improved through recorded history.

There aren't just bad people that commit genocide; we are all capable of it. It's our evolutionary history.

For each of our actions there are only consequences.

Geological change usually takes thousands of years to happen but we are seeing the climate changing not just in our lifetimes but also year by year.

If a power station were to be built down the road, I'd prefer a nuclear plant over an oil burner, and definitely over a coal burner. We simply have to lessen our consumption of fossil fuels.

Up to [Monday], there was no evidence at all that there could be -- or is -- an individual in which there might be the reasonable question, 'Did they get infected from a piece of mail that went to their home?' ... That is being intensively investigated right now.