I gave a TEDYouth talk in November that was recently uploaded and featured on TED's main website. It's about the physics we can learn from clusters of galaxies for sure, but I also tried my best to convey what doing science is really about.
Here is the link:... (more)
In ordinary quantum mechanics, the observables of a system are a bit odd in one sense --- they are no longer variables, but operators. In a broader sense, however, they are not so odd. If you can measure the position of a particle in classical mechanics, you can measure its position in quantum me... (more)
A Cosmic Parable Once upon a time, there was a long string with evenly spaced beads on it.