The Stanford Encyclopedia of Philosophy is a wonderful resource and a rare bird: It's a refereed work by > 1500 professional philosophers, and it's free. When

The Stanford Encyclopedia of Philosophy is a wonderful resource and a rare bird: It's a refereed work by > 1500 professional philosophers, and it's free. When I want to read in-depth about a topic in mathematics or logic, for example, (and if there is an SEP article on it) there are few authoritative alternatives on the web. The articles are written by subject specialists in a field which focuses on the subtleties and complexities of reasoning, and they aren't writing for the evening news, so their articles do take some time and investment from the reader. Consider supprorting them: http://plato.stanford.edu/support/ http://plato.stanford.edu/support/