Back in high school, I lost 1st place in the Weizmann Safe Cracking Physics Contest over this. You had to build a safe that anyone with a sufficiently advanced

Back in high school, I lost 1st place in the Weizmann Safe Cracking Physics Contest over this. You had to build a safe that anyone with a sufficiently advanced knowledge of physics could open. The winning team had placed a magnetic switch in the middle of a long tube inside their safe. You could toggle the switch if a magnet fell down the tube slowly enough, but it never worked no matter how you dropped it. The solution was to first insert a roll of tinfoil inside the tube. They also used a gauss cannon: http://en.wikipedia.org/wiki/Coilgun http://en.wikipedia.org/wiki/Coilgun http://wis-wander.weizmann.ac.il/14th-safe-cracking-contest http://wis-wander.weizmann.ac.il/14th-safe-cracking-contest http://www.weizmann.ac.il/zemed/upload/13(3).pdf http://www.weizmann.ac.il/zemed/upload/13(3).pdf