Oh, Marxism!

"...it becomes impossible to distinguish sciences like physics and biology from other belief systems - such as Marxism, witchcraft, and intelligent design - that claim to be scientific." - Lee Smolin in his book, The Trouble with Physics.

Marxism, witchcraft, intelligent design ... one of these things is not like the other. Or maybe not.

(This one is really just for Saman and Soos.)