Amber Alert Commentary

_{This is totally off-topic}

Today I was taking a break in Starbucks when I read an article in the local (Boston) paper about the Amber Alert system. I was surprised.

For those of you who aren't up-to-date on paranoid mothers, the Amber Alert is when the government posts state-wide panicked messages about kidnapped children to every media available.

I don't like it.

Not because of what it is, but because of the fact that it doesn't work efficiently. It just makes people feel good about themselves and their politicians. Lemme explain.

The Amber Alert was designed to help find children who are kidnapped by deranged strangers with bad things in mind. However, most deranged-stranger kidnappings resolve (usually poorly) within a few hours, long before the Amber Alert is issued.

Along the same lines, the Amber Alert is usually issued for children kidnapped by family in custody battles gone awry. This is because deranged family members are far more common than deranged strangers. Unfortunately, the Amber Alert is not designed to help in these sorts of situations, so it's not very effective.

You may have seen the apologist ads for the Amber Alert. They generally say something like "95% of Amber Alerts end with the child being found." This is a little like claiming "95% of my blog posts end with the internet still being operational". The Amber Alert almost never has anything to do with the safe rescue of the child: it's usually the police tracking down the deranged family member who kidnapped the child.

I also don't like the way that Amber Alerts are posted, because they imply that the child was whisked away by a deranged stranger. This lets moms get all worked up about the number of kidnappings... but it's just a distraction. Your child is at more risk from people you know than from strangers, and thinking otherwise means your worry will be pointed in the wrong direction. (Your child is probably not even at any significant risk from people you know, either. But if you're going to worry, worry about the right things!)

Anyway, I like recovering children from kidnappers, I think it's good. But I don't really like the Amber Alert: it's just theater. It has successes, but a more carefully planned and researched system would have more successes. With, you know, less panic and misinformation.

...

I was reading this Boston paper and... they said the same thing.

I was absolutely stunned.

Okay, they didn't say the same thing. They presented a "fair and balanced" view that aired both sides of the question. But that they even mentioned my side is astonishing. It's pretty rare for a paper to question theater because, let's face it, news media is 99% theater.

I was... surprised.

Of course, the rest of the paper was basically fluff. I guess they have a quota.

No More!

I just got hit with a flurry of annoying theories using the ever-popular "Two Axes of Whatever" approach. I really hate that shit. I don't know why, it just rubs me precisely the wrong way.

Which means I was very pleased with this cartoon you already read.

I wonder if he's been reading the same essays I've been reading...

Ferns on Glass

This is even more off topic than last post. :P

This morning, I noticed that wet windows get a peculiar ice pattern when it's cold enough to freeze them. This pattern looks exactly like fern leaves. The window literally looks like someone painstakingly painted a fern on the glass, vein by vein.

Curious, I melted the ice, re-wet the glass, and watched it freeze.

As far as I can tell, the principle is extremely simple. The reason it looks like ferns is the combination of three factors. First: it's colder at the bottom of the pane than the top, so the water at the bottom freezes first whereas the warm, moist air from the shower keeps the top warm for some minutes, until it cools or radiates away.

Second: small amounts of water freeze faster than large amounts of water (duh).

Third: water trickles down water faster/easier than it trickles down ice.

The combination of these rules means that the points on the glass which are only thinly coated rapidly freeze, but wherever there is a slightly larger amount of water, it takes a bit longer. The water above tries to trickle down, but only really trickles down at the areas where it is still liquid. The more liquid trickling down, the "larger" the "vein" is when it finally freezes.

Water can only travel so far before it freezes, as a function of the size of the vein it is traveling down. This means that everywhere on the window, there are veins. Because of the math behind the forming of veins, this results in main veins which radiate smaller veins, which radiate smaller veins, etc.

The main veins (the "spines" of the "leaves") have graceful curvatures that slowly slope from being within ten degrees of vertical to being around forty-five degrees or sometimes more. I think this is because water flows down the window easier than it flows up. (Although, as far as I can tell, it must either flow up to veins above it or somehow form a vein that looks as though that is what happened...) So, essentially, as the air cools from bottom to top, the freezing process becomes more imminent for water on the same vertical level. Warmer water from above slides down the spine without freezing, but the colder water from a local level freezes, forming a channel for a spine which is more horizontal than it was. I think it's a smooth curve because of the steady flow of water: this isn't a flash freeze, or it would probably be considerably more jagged and straight, like dry window or very low-temperature frost.

This tendency to flow down also means that there is less water at the top of the window when it finally does freeze. This means a more delicate set of veins - the "tip" of the leaf.

It really does look so much like a cluster of leaves.

Anyhow, whatever the full math behind it is, it is an interesting and iterative process. It's not like watching a printer print out leaves: the start is rough and squiggly, it's only as time progresses that it refines. Large patches of what look like empty glass will develop fronds. It's very impressive.

Also, the heat and moisture totally change the type of leaf you get. While the leaf structure was a wide-frond fern when I got there, after my melting and re-icing it was a narrow-frond fern with lots more leaves.

The end result is surprisingly organic and beautiful, something that wouldn't be out of place hung on someone's wall. The rules are fairly simple - I bet they could even be simulated with relative ease.

Now, if three simple rules can create something so complex and beautiful...

Can you make a game that uses three simple rules to make something that complex and beautiful?