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Day 0

Day 0 started rough, but God worked through it all. I packed up my campsite near the university, piled everything into a shopping cart around noon, and pushed it across town to New Hope, a local church that’s been providing space for John Martin’s Community Support Group on weekday afternoons. An old man came in; we provided him with clean clothes, some food, and I let him lie down to rest with my blanket to cover him and my rolled up sleeping bag as his pillow. I was the only person cleaning up, and when I was done, I woke him, then went upstairs to help carry a coffee maker downstairs for an evening meeting. When I returned, the old man was gone, along with my blanket and bag!

I left a suitcase and the shopping cart at church, started heading downtown at around 6 PM, saw him on Delany Park strip, walked over to him and he talked to me like trash!

“I’ll be over Town Square,” I said.

“I don’t care if you go to the moon!” he replied.

Not even a thank you for the bag. I lugged the rest of my stuff over to Town Square, dropped it all down, and started to cry. Why am I doing this? I’m broke; I’m homeless; I have no sleeping gear, now. Is this really what God wants?

I started thumbing through my Bible, and came to Luke 6:30: “Give to everyone who asks you and if anyone takes what belongs to you, do not demand it back.” Well, I said to myself, that’s what I just did!

So I took out magic markers, wrote that passage on two signs, taped them together and set them up:

Luke 6:30

Then I started begging God again to provide me warmth to sleep that night. A friend of mine texted me and I called him back and told him what had happened. Even though he was pretty tired, he said that he’d buy a sleeping bag at Wal-Mart and bring it over.

That inspired me to write a second sign, Matthew 25:35:

I was part way into a third sign when John Martin showed up, and by the time my friend got there with a sleeping bag and a tarp I was able to introduce them. Then I finished the third sign:

Finally, I added a fourth sign to explain why we were doing all of this and now I had one from each Gospel:

My first interaction with the police came around midnight. John was still there, which was great, and the exchange was very cordial. I basically preached a brief sermon, explaining to the police officer why I was there.

This text will be replaced

John left soon after the police did, but quickly returned with a deaf mute in a wheelchair. We could only communicate with him by writing, but it was clear that he had no place to go, so I let him sleep at the site.

He got the sleeping bag.

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Faster Sailboats

I may never have been on a sailboat in my life, but I am fascinated by the physics behind their operation. They must operate simultaneously in two mediums, as both an airfoil and a hydrofoil. Plus, they are probably one of the “greenest” vehicles ever conceived.

Which makes you wonder why we don’t use them more.

Not only are they dependent on the weather, but they are also considerably slower than an airplane. I’ve been thinking about how to make them faster, and my inspiration came from a book about airplanes – The Deltoid Pumpkin Seed by John McPhee. This book documents, in popular language, the experiences of a group of entrepreneurs and engineers to build a hybrid airplane/airship (the Aereon) that would have a small engine and use helium to improve its lift characteristics.

Why not do the same thing with a sailboat? Especially since most of the drag comes from the “wetted hull”, it would make sense to lift the hull out of the water as much as possible and leave only the keel submerged. Ship designers have been doing this for years with cleaver hull designs intended to lift themselves out of the water as they get up to speed, but the Aereon design suggests another way – helium.

What seems to make sense to me would be to build a trimaran and fill the outriggers with helium.

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Cold Fusion

A friend of mine recently bent my ear for an evening over cold fusion. It struck me as pseudo-science, but not wanted to be prejudiced, I spent some time with a web browser looking into it.

Though I still have a hard time believing some of these claims, I have to admit that this technology shows promise.

The Coulomb barrier that must be overcome to fuse two protons is about 5 MeV – not something you’d expect at room temperature, but well within the range of a standard particle accelerator. The problem is the minute cross section of the nucleus – protons with enough energy to fuse are far more likely to be scattered away from each other unless they are precisely aligned in a head-on collision.

That’s where the cold fusion claims start to get interesting. All of the cold fusion reports that I read involved palladium as a catalyst. Now palladium has the unusual property that it can absorb significant quantities of hydrogen. There doesn’t seem to be a consensus on exactly how this works, but one explanation is that the hydrogen nuclei can move fairly freely within the palladium crystal mesh. Now if I wanted to line something up at atomic dimensions, a crystal would be the obvious choice, and if I wanted to line something up while its moving, then I would want a crystal that allowed my particle mobility. So palladium seems like an obvious choice to line up moving protons to precisely collide them.

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Dynamic addressing

A theorem of Thorup and Zwick (Proposition 5.1 in 2001’s Approximate Distance Oracles) states that a routing function on a network with n nodes and m edges uses, on average, at least min(m,n^2) bits of storage if the “route stretch” (the ratio between actual path length and optimal path length) is less than 3 (i.e, if two nodes are two hops apart, the actual route taken between them must be less than six hops). On the Internet topology, we can expect the n^2 term to dominate, so spreading these n^2 bits out among n nodes yields an average of n bits per node – i.e, each router’s routing table has to hold one bit for every device on the network.

Not a very encouraging result for those of us designing routing protocols.

Yet there is hope. The result is only an average. We can do better than the average if we allow our routing function to be skewed towards certain network topologies. And it occurs to me that the Internet doesn’t change fast enough that we can’t skew our routing function towards the current network topology.

How can we do this? With dynamic addressing: skewing our address summarization scheme to reflect the current network topology.

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DNS-based identification

I’ve written before about how the failure of source routing created the need for NAT, but that post didn’t address the basic security problem with source routing that caused ISPs to disable it. It allows a man-in-the-middle attack where a machine can totally fabricate a packet that claims to come from a trusted source. There’s no way that the destination machine can distinguish between such a rogue packet and a genuine packet that the source actually requested be source routed through the fabricating machine. At the time, Internet security was heavily host-based (think rsh), so this loophole became perceived as a fatal security flaw that led to source routing being derogated and abandoned.

A quarter century later, I think we can offer a more balanced perspective. Host-based authentication in general is now viewed as suspect and has largely been abandoned in favor of cryptographic techniques, particularly public-key cryptosystems (think ssh) which didn’t exist when TCP/IP was first designed. We are better able to offer answers to key questions concerning the separation of identity, address, and route. In particular, we are far less willing (at least in principle) to confuse identity with address, if for no other reason than an improved toolset, and thus perhaps better able to judge source routing, not as a fundamental security loophole, but as a design feature that became exploitable only after we began using addresses to establish identity.

Can we “fix” source routing? Perhaps, if we will completely abandon any pretext of address-based authentication. What, then, should replace it? I suggest that we already have our address-less identifiers, and they are DNS names. Furthermore, we already have a basic scheme for attaching cryptographic keys to DNS names (DNSSEC), so can we put all this together and form a largely automated DNS-based authentication system?

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Corrupt Education

I recently toyed with going back to school for graduate study in mathematics, going so far as to apply to a university. I won’t parade all the details, but I think it was a positive experience. I reached an epiphany, a conclusion that I’ve been resisting for years, but have finally accepted:

A university is a corrupt institution.

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iDictionary

Apple’s recent announcement of the iPhone has inspired me to reconsider how IT can be used to support foreign language studies. According to Apple, the iPhone will have a microphone (it’s a phone, after all), run OS X, and have 4 to 8 GB of memory. That should be a sufficient platform to load a voice activated dictionary. After training a voice recognizer, you could speak a word into the device which it would then lookup in a dictionary and display the dictionary entry on the screen, providing language students with the detail of a full sized dictionary in something that could fit in their pocket.

Could pocket Spanish-English dictionaries be a thing of the past?

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Dynamic DVD

As streaming video has become more commonly available, it is now plausible to discuss offering a video interface to a website. A user could connect to a site using a video client and “navigate” on-line video content using a DVD-style user interface – video menus, highlighted on-screen buttons, fast-forward, subtitles. Alternately, such an interface could augment conventional TV broadcasts, offering a nightly news program with video hyperlinks to hours of detailed coverage of events we currently see only in sound bites.

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