Since its debut in October 1994, the online textbook Chaos Quantum and Classical has aimed to provide physics graduate students with an up-to-date and authoritative course on chaos. In the words of the book’s lead author, Predrag Cvitanovic of Georgia Tech, “It is better to have a webbook accessible to one and all, continuously improved, at the forefront, rather than chiseled in stone.”

To add human interest to his course on Sun–Earth interactions, UCLA’s Mark Moldwin has put together a webpage devoted to the pioneers of the field. His Timeline of Solar-Terrestrial Physics starts with Aristotle’s Meteorologica of 850 BC and ends, at least for now, with Jim Burch’s and Bill Sandel’s IMAGE observations of 2001.

At Quantum Diaries you’ll find the weblogs of 27 particle physicists from around the world. The diarists write as much about their lives (dirty diaper changes) as about their work (neutrino flavor changes). Quantum...

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