Listen to the podcast Question: What is Twitter, and why are my students so obsessed with it? The IT Guy says: Twitter is one of those ingenious ideas that is kind of hard to explain. That's not going to stop me from trying, of course! Twitter is a combination of several different popular

Bird in a Cage

 This is an online version of the famous "bird in a cage" illusion caused by a lingering afterimage. An additional image creates a "stars and stripes" illusion, illustrating the same effect. Stare for 20 seconds at a bird of a

Bird or Dinosaur?

Investigation of Archaeopteryx, an animal whose fossilized remains first led scientists to suggest that birds and dinosaurs are related, takes learners through a consideration of all the things that make a bird a bird and a dinosaur a dinosaur. Richly