here are three of many science resources for stimulating your neurons, and perhaps inducing actual cogitative activity:
~~ Science 2.0 - a lively and very well-informed blog by hank campbell.
~~ Science Codex - a news source on a wide range of topics within science.
~~ the Science portal at Wikipedia - ditto.
there are, of course, many such resources. feel free to recommend your own favorites, using the "comments" tag below. thanks.