See sound without drugsI have created an application that just turns on the microphone and continually plots the FFT magnitude of what it records. It allows control over the window size and sampling rate.
Email EtiquetteIf you begin your emails with "Hi, <name>!" then they will seem less rude.
Exploiting perceptual colour difference for edge detectionThink colour isn't important in image processing algorithms? Let's try it both ways, and see for yourself.
VP trees: A data structure for finding stuff fastLet's say you have millions of pictures of faces tagged with names. Given a new photo, how do you find the name of person that the photo most resembles?
In the cases I mentioned, each record has hundreds or thousands of elements: the pixels in a photo, or patterns in a sound snippet, or web usage data. These records can be regarded as points in high dimensional space. When you look at a points in space, they tend to form clusters, and you can infer a lot by looking at ones nearby.