Most fun you’ll have debugging all day

Weird Bug starts off for the first, say, 30 seconds looking like your standard puzzle-maze game, until you realize the first maze isn’t beatable, and that the real puzzle is how to go into the source code for the maze and fix it so the maze can be beat. The mazes are implemented in PuzzleScript, and the bulk of the game you’re in an IDE interface, changing the code, rebuilding, and playing your fixed level to get on to the next, broken level. If you’ve ever coded before, you’ll be able to figure out PuzzleScript in just a minute or … Continue reading Most fun you’ll have debugging all day

Don’t leave the panopticon

I’m pretty blown away by Nothing To Hide, a currently free, browser-based puzzle game with a great premise and one of the most interesting introductory “scenes” I’ve come across. You play a character who must ensure that they are being surveilled at all times while moving around the world (for reasons the opening will make clear). The web-version is actually a demo being used to raise funds for a full version, but it’s as polished and fleshed out as any number of full online games I’ve played. Even in its handful of levels, you get a taste of the variety … Continue reading Don’t leave the panopticon

Math, Music, Ciphers

I hadn’t run into the unsolved Dorabella cipher before (that I remember). If you enjoy such things I highly recommend this account of it, with its many proposed decryptions that make clear why one of the conditions for a verified solution is that it “be self-evident”. It’s an excellent example of why decyphering without context is hard (maybe impossible?). And I enjoy the proposed solution that takes encryptions errors into account as a possibility, considering that it was done by hand, and by someone considered prone to such errors.

Myself, I went with the LEGO calendar

Ringing in 2014 by shopping for a new office wall calendar, I’m happy to be able to bring you the weirdest wall calendars available right now on Amazon – free shipping for Prime members, so you know you want one of these! I Could Pee on This 2014 Wall Calendar: So many cats, reminding you that they have a whole year’s worth of peeing on your belongings ahead of them. Food Landscapes 2014 Wall Calendar: A Year of Scrumptious Scenes: Sure you could have a calendar of beautiful landscapes, but a calendar of beautiful landscapes reimagined through food is so … Continue reading Myself, I went with the LEGO calendar

How It Works: Bitcoin Edition

Nothing like avoiding end-of-the-year physical cleanup with end-of-the-year virtual cleanup! I finally got around to reading this detailed description of how Bitcoin works, recommended by Schneier on his weblog, and I need to hang on to this for next time I’m teaching security. From a teaching perspective, it does a nice job of showing how all of the various types of cryptography come together in an interesting way in this protocol. This is the part that always seems sort of wild to me: The idea is to make it so everyone (collectively) is the bank. In particular, we’ll assume that … Continue reading How It Works: Bitcoin Edition

Stabby Robot Less Stabby

First, and most important obviously, this is pretty neat research into training robot motion with online, and non-optimal, feedback. It’s a nice consideration of the type of feedback one is likely to get, or to get easily. And the illustrative video on their page is pretty great (I found the moment when they showed the robot how to point the knife towards itself, not someone else, adorable…) But it’s also worth noting that the TechCrunch story on the research is pretty hysterical: “Cornell Researchers Help Robot Unlearn Stabby Motions With A Human Trainer”.

Building the right community for community editing

There’s something unavoidable about Wikipedia, even when you acknowledge its flaws, which makes it a constantly interested phenomenon to investigate and analyze. As the article notes, its rankings in search results and use in question answering systems like Siri only make it more interesting to understand what’s going on with it. Looking at the effect of the editorial structure and automated tools for handling edits is particularly interesting; I hadn’t really thought about the effect of bots on participation in this way: In their paper on those findings, the researchers suggest updating Wikipedia’s motto, “The encyclopedia that anyone can edit.” … Continue reading Building the right community for community editing

Watch where you put that phone

This is awesome – I’ve long been in love with intrusions that rely on listening in on the sound of keystrokes, or the wiggle of a laptop screen, or what have you to learn and then reproduce what has been typed. This variation where a smartphone on your desk can pick up typing vibrations and from there learn to recognize what you are typing. It’s proof of concept, not found out in the wild at this point, but still very cool.

Are you ready for some learning?

I’m about a week out from another academic year starting (my tenth! how frightening!), and so it’s timely to share a few thoughts about learning and being a student… Lots of attention is going to this article about a study showing that laptop use in class results in lower grades. Less press is going to the portion I remember most from when the article first came out – that someone next to you using a laptop also causes scores to drop. I’ll be mentioning this in my explanation for why I sometimes lock the classroom computers when we’re having discussions … Continue reading Are you ready for some learning?

Traveling Happy Truck Drivers

Starting out as an explanation of the traveling salesman problem, this article goes on to also be an excellent, and I think understandable, explanation of what an algorithm is and computational complexity. If you want to get a quick sense of what computer science is concerned about that goes beyond just “how to program”, and is more the “how to solve problems” side of things, this is a good read. In 2006, for example, an optimal tour was produced by a team led by Cook for a 85,900-city tour. It did not, of course, given the computing constraints mentioned above, … Continue reading Traveling Happy Truck Drivers