# Khan!

I’d like to like Khan Academy. I like its goals. I like how its website works (not surprising, given that John Resig works there). And I like how it makes its videos available in different ways: streaming on its site, streaming on YouTube, and downloadable for playback anytime. But every time I’ve watched a Khan…

# iBooks Author

Between Kieran Healy, Glenn Fleishman, Andy Ihnatko, and John Siracusa, almost everything I might have said about iBooks Author at this early date has already been said. Kieran and Glenn made the point that we’ve been hearing about computer technology revolutionizing education for decades—Kieran even got off a joke comparing iBooks Author to Encarta, something…

# Learning

Many years ago when I was a new faculty member, the older guys in the department would tell us youngsters that the best way to learn a topic was to sign up to teach it. They were right. Over the years, I’ve learned some important corollaries to that rule of thumb. Before I go any…

# To infinity and beyond

Here’s a math problem my sixth-grader came home with last night. You have a bottomless pit with [x] marbles in it. Two of the marbles are black. You reach in and pull out two marbles at random. If [p(x)] is the probability that both marbles are black, what is [\sum_{x=3}^\infty \;p(x)] I sure don’t remember…

# Civil War and Reconstruction

If recent stories about the 150th anniversary of the start of the Civil War have piqued your interest, I highly recommend this series of lectures by Professor David Blight of Yale University. That’s a link to the Yale site, but you can also get it directly from iTunes U. Here’s the course description: This course…

# Fraction arithmetic practice sheet

The next logical step after yesterday’s worksheet for reducing fractions is one for adding and subtracting fractions. The rules for using it are the same as my other math practice sheets: A new set of problems is generated every time you open or Refresh/Reload the page. You can use the version online or save a…

# Fraction practice sheet

I had a long drive today, and I passed the time by thinking about making a new set of math practice sheets for my ten-year-old son. This year has been fraction-heavy, so I thought I’d start with a simple one: a page with a bunch of proper fractions that may or may not need to…

# Capo 2

Capo 2 from SuperMegaUltraGroovy just came out, and it’s a huge leap forward from Version 1. The basic functions for learning a piece of recorded music are still there. You can: Slow down the piece without changing the pitch. Speed up the piece without changing the pitch. Transpose the piece into a different key. Set…

# Clock practice for kids update

For reasons I can’t explain, my original post on printing time/clock practice sheets for kids always forced you to download a zipped archive of files to your local computer, unzip them in some convenient place, and launch them from your hard drive. While this is no burden to my geekier readers (who might prefer a…

# Podcast cannibalism

Well here’s an unfortunate bit of convergence. The Science Show, a radio show about—you guessed it—science from ABC Radio National in Australia, has decided to rebroadcast episodes of Radiolab, a radio show about science from WNYC in New York. This is great for Science Show fans from the antipodes who listen over the air, because…