Chirp

Finally signed up for “The Twitter.” When I first learned of it, I thought it would just be a compendium of noise, since the threshold to tweet is so low. And this is precisely why I don’t do Facebook very much — I am just not all that interested in the level of minutia of my friend’s lives, and I shudder to think they are that interested in mine (or feel that they’re missing out because I don’t post such trivialities very often). But today I found out that Steve Martin is tweeting, so I signed up to follow that.

I don’t want it to be a collection of “Boy, I could use more fiber in my diet” or “De-linting my belly button!” tweets. On the other hand, I do have these random thoughts, which I occasionally blog. That’s the kind of stupid stuff I’ll probably tweet. Probably.

Twitter: Swansontea

I understand it’s protocol to follow those who follow you, but … no. I’m not going to return the favor in order to be a statistic, or even to be polite. I am a physicist, and have no social skills. Follow only if you have some slight possible interest in the content.

Legislating Reality

Senate set to slam science

There are certainly ample political reasons to sometimes ignore science. Fine. Say that. But discounting or demonizing science for political ends needs to stop. Science is not subject to legislation. It’s one thing to make the case that we cannot afford to deal with greenhouse gasses right now. It’s another entirely to claim greenhouse gasses are not putting us at risk.

The Needs of the Many Outweighs The Needs of the Few

Self-organizing traffic lights

The key is that this kind of control does not fight the natural fluctuations in the traffic flow by trying to impose a certain flow rhythm. Rather, it uses randomly appearing gaps in the flow to serve other traffic streams. According to their simulations, this strategy can reduce average delay times by 10%–30%. Remarkably, the variation in travel times goes down as well, although the signal operation tends to be non-periodic and, therefore, less predictable. You can’t say precisely how the lights will go on and off, but you can be sure your drive will be shorter.

So it sounds like if you’re in a dense group of cars, you’ll see more green lights, but if you are alone or in a sparsely bunched group, you’re likely to get a red, Which bunches you up, et cetera, et cetera. IOW, opposite of the way lights seem to run.

A View of the Neighborhood

The Big Picture: Around the Solar System

With dozens of spacecraft currently orbiting, roving or otherwise and traveling through our solar system, I thought it would be interesting to get a general snapshot in time, using images from NASA and ESA spacecraft near Mercury, Earth, the Moon, Mars, Saturn and a few in-transit to further destinations. Collected here are recent images gathered from around our solar system, at scales ranging from mere centimeters to millions of kilometers.