Science rules, and pseudoscience drools…but which is which? Learn about Kuhn, Popper, and the demarcation problem!
A brief summary by Popper of his principle of falsificationism - http://www.stephenjaygould.org/ctrl/popper_falsification.html
“The Structure of Scientific Revolutions,” by Thomas Kuhn - http://projektintegracija.pravo.hr/_download/repository/Kuhn_Structure_of_Scientific_Revolutions.pdf
The Stanford Encyclopedia of Philosophy’s fantastic entry on science and pseudoscience - http://plato.stanford.edu/entries/pseudo-science/