Teachers: Never, ever, ever not believe a determined, smart student. Student makes suspected TNT in class.
For further reading, "Mushroom: The Story of the A-Bomb Kid." Back in 1977, Princeton student John Aristotle Philips is able to show how to build an A-Bomb, Macgyver style. What took the Manhattan Project years was done in 5 months using off the shelf books and phone calls. See http://www.europeancourier.org/terrorism