Spirit Nut Set: A brass nut is handed for inspection along with a length of cord. The spectator is asked to thread the nut on the cord, and then to hold both ends of the cord. It will now be seen that it would be impossible to remove the nut without letti
The Crystal Card Case has long been one of the highlights of the Dick Zimmerman lecture, but a special box had to be created in order to performer it. At last, here is everything you need to dazzle and impress your audience with this masterpiece of visual
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