A Trump presidency - neutral between dictatorships and democracies, opposed to free trade, skeptical of traditional U.S. defense alliances, hostile to immigration - would mark the collapse of the entire architecture of the U.S.-led post-World War II global order.

I believe in ghosts now because of New Orleans. I never did before. I was so skeptical, but now I've seen one, which sounds insane, but it's true.

Technology is mostly a force for good, but it has its downsides, too. I want my students - and my readers - to be intelligently skeptical about technology and be informed about the good and the not-so-good parts.

I want students to understand specific technologies, but the real goal is that they should be able to reason about how systems work and be intelligently skeptical about technology so that, when they're running the world in a few years, they'll do a good job.

My first inclination is to be a bit skeptical about the claims that human-produced carbon dioxide is the direct contributor to global warming.

I think whenever you see what may be the seeds of a third party, you need to be very skeptical because there's not a very good track record for third parties.

Some people are skeptical about the value of indictments where a foreign nation-state actor is involved. But in the case of APT10, the indictments marked an important step in publicly exposing China's continued practice of stealing intellectual property to give Chinese firms an unfair advantage in the marketplace.

I agree with Chomsky in almost nothing. When it comes to innate structures and so on, I'm very skeptical.