Here lies the secret...
Q. Will an ordinary experimental pyramid sharpen metal? If so, how long does it take?
A. Yes, a cardboard replica may even sharpen knives, scissors, razor blades and surprisingly, even electric shavers. Correct exposure time depends upon many factors. But, if the test is set up properly, noticeable results have been reported after over-night pyramid exposure. Electric razors and heavy duty cutlery may require two days or more. Interesting to note that WWI Russian soldiers discovered that a full moon dulled a razor's edge.
For real, I saw it on the Internet.!
http://www.dowsing.com/Pyramid/pqanda.htm
Hahaha ;)