555 Timer Tutorials http://www.williamson-labs.com/555-tutorial.htm
Videos on 555 Timers http://video.google.com/videoplay?docid=5374934087428237879&ei=OHfgSpeQA6L6rAKj3ZG7Cg&q=555+timer#
Oscilloscope Tutorials http://www.hobbyprojects.com/oscilloscope_tutorial.html
This is from eGFI on how to bake and build the most structurally sound gingerbread house as tested and reported by 2 students from the University of Brittish Columbia Gingerbread Engineering