Category Archives: Uncategorized

I’ve traveled in a time machine!

back-to-the-future-deloreanIn the last post I talked about time travel to the past.  What about time travel to the future?

There’s a boring sense in which we’re all moving into the future at the rate of one second per second. But that’s not what we mean. What about farther into the future than it takes from our point of view? What about Marty McFly traveling from 1985 to today (October 21, 2015) while remaining young. Is that possible?

Yes, it is.

In fact, I’ve been in a time machine that takes its passengers into the future. It cost me several hundred dollars, and it wasn’t very far into the future, but still — I did it.

And in all likelihood, so have you. This marvelous time traveling device is — … — (wait for it) — Continue reading

Is time travel possible?

MV5BNjE5ODg4NzY1MF5BMl5BanBnXkFtZTcwMjI3MzYwMg@@._V1_SX640_SY720_Short answer: time travel to the past is possible (but not actual), and time travel to the future has actually happened already.

Today is Back to the Future Day, the day that Marty arrives in the future according to the 1989 movie. So it’s a fine day to discuss time travel.

Is time travel possible?

Well, to answer this, we first need to clarify what variety of time travel we’re considering.

What we usually have in mind is time travel to the past. But here there are distinct pictures that we have in mind. Continue reading

I’m published in The Atlantic!

imagesWell, not in the magazine itself, just online.

Well, only on a blog, to be honest.

And it’s only two dozen words long.

And my name isn’t mentioned.

But still, them’s my words there in James Fallow’s post (click “read on”):

I think we need a simple t-shirt slogan: “The NRA is immoral.”

The fact that everyone will understand the message is all that really needs to be said.

My earlier letter-to-the-editor moments of fame are here and here.

Still Dowsing for Bombs in Iraq

I glanced at a news story about Iraq today, and what did I see?

Dowsing rods!

I’ve discussed before the fact that the Iraqi government has spent over $85 million for these dowsing rods that are supposed to detect bombs.

I suppose once you’ve sunk that sort of money in, you might as well use them.

And, to be fair, security theater might have its uses. If the bad guys don’t know that the wands are useless hocus pocus, they might be more wary of trying to sneak through checkpoints — and the the apparent triggering of a dowsing rod might trigger a real psychological reaction that a security agent could recognize.

The problem, of course, would be if the wand wavers thinks they’re actually able to detect explosives and that leads them to let up on other reasonable security measures.

Wondering how common the dowsing rods are, I did a quick Google image search for “Iraq Checkpoint.” Looks like they’re common. A few more pics after the jump.

Continue reading

Explaining Consciousness

Here’s a TED talk by David Chalmers.

I don’t have time right now to watch it, but I’ll probably assign it to my students this fall, and I imagine I’ll offer some comments at some point.

First reaction: “Whoa! Chalmers shaved and got a haircut!”

I guess he hit the 20-years-out-of-Santa-Cruz mark. That’s about the same point I cut my hair off too.

Your anti-Pi Day rant

Not everyone is excited about Pi Day:

Can “science” explain what happened to flight MH370?

Malaysia-UFOI’ve long been intrigued by psuedoscience and conspiracy theories (ever since I took an undergraduate philosophy of biology class and read some exchanges between creationists and scientists). I’m particularly fascinated by what such accounts reveal about how we assess and deal with our own ignorance.

There are lots of things we don’t know. The important question (to this philosopher, at least) is is what conclusions we draw from our lack of understanding.

One of the features of pseudoscience/conspiracy theories/denialism is the tendency to draw some positive conclusion from our ignorance of some fact. This is is a fallacy known as an “argument from ignorance,” which at root has the following form:

  1. I don’t know that P is true.
  2. Therefore P is false.

This is often coupled with a another fallacy, known a “false dilemma,” which has this form:

  1. P is false.
  2. Therefore Q is true.

Obviously this is a fallacy when and only when the implicitly assumed disjunction (“either P is true or Q is true”) doesn’t actually hold — that is, when the supposed dilemma is a false dilemma.

We find an example of this sort of bad reasoning in many current discussions of the mysterious disappearance of Malaysia Airlines jet. There was a roundup of some crazy conspiracy theories about the missing plane in my local paper the other day (My favorite on that list is that it was destroyed by a mini black hole, but they didn’t notice the even juicier theories that involve a time-travel portal.) There’s another, more politically themed, list here.

As I expected as soon as I heard about this case, the alien abduction crowd sees this as decisive evidence that a flying saucer has nabbed a plane full of Earthlings. See for example, here (and you’ll want to read the comments too):

There were no reports of bad weather and no sign of why the plane would vanished from radar screens almost an hour after it took off. There are reports of two oil slicks off the coast but absolutely no wreckage has yet to be found. Where did the plane go?

There is only one possible answer. Aliens.

“There is only one possible answer.” There’s your false dilemma in a nutshell.

Let’s bring this back to questions about science and denialism. Notice that we have a genuine mystery that standard accepted processes of reason and evidence has been unable to solve. Call that “science” if you like. Here’s something that science hasn’t explained.

But the denialist needs to go further. The denialist needs to say that we have something that science cannot explain.

Now it’s undeniably true that this is a case that is unexpected for those of us who don’t think that aliens visit Earth and abduct humans. We’d have thought that if a flight didn’t land where it was supposed to, we’d find the airplane (or what’s left of it) somewhere along the flight path sooner than later.

But it’s obviously not the case that all non-alien (or non-time-portal) explanations have been ruled out. We have no reason to suppose that science can’t explain what happened, and we have every reason to suppose that science will discover what happened eventually.

And what’s true for missing airplanes is also true for so-called “missing links” in evolution, and other supposed gaps in our naturalistic account of the world. There’s much that we don’t understand, but none of the mysteries we find give us reason to suppose that there’s something paranormal, or conspiratorial, or supernatural, going on.