About all we'll be able to do is retroactive studies on humans, in nine or 10 years, looking back at this crop of teen-agers who've been using Ecstasy and assessing if damage has been done to their brains,

That means you can do what you're doing, but you have to change how you're doing it, ... That's retroactive.

I think it's imperative that the word gets out that this is not a trivial substance,

I still hear young people saying, 'Well, this isn't like cocaine, this isn't like methamphetamine, and if I only use a small amount it should be safe.' That's very foolish, because this drug has the potential to cause serious problems.

Robots have gotten steadily more capable, but humans' expectations that robots should have minds keeps biting robot developers.

It is futile to talk too much about the past . . . like trying to make birth control retroactive.