I've got personal views on the '60s. You can't have freedom without paying the price for it.

You mustn't take what I say as gospel because no one can second-guess the future.

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

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

One thing that being a scientist has taught me is that you can never be certain about anything. You never know the truth. You can only approach it and hope to get a bit nearer to it each time. You iterate towards the truth. You don't know it.