Benoit Mandelbrot, who created the mathematics of chaos and complexity, has passed on. James Gleick's book Chaos: Making a New Science is, in my opinion, one of the best introductions to chaos theory, with a minimum of mathematics. As a side note, the phrase "chaos theory" is a misnomer, as Mandelbrot's major contribution was to show that the incredible complexity of nature could be modeled with very simple, almost trivial, equations.