http://cdn.makezine.com/make/pseudoscope.pdf Weekend Project: $10 Pseudoscope (PDF) http://blog.makezine.com/archive/2009/05/weekend_project_10_pseudoscope_pdf.html?CMP=OTC-0D6B48984890 2009-05-08 http://makezine.com/images/logos/rss_icon.jpg