"Quick Calculations" by Shi Fengshou in English? I'm looking for an English manual to "Shi Fengshou Rapid Calculations." Apparently the guy wrote a book in Chinese sometime between 1970 and 1980 called "Quick Calculations." However, I haven't been able to find an English translation of it. I would settle for any book about his "rapid calculation" formulas, but I haven't been able to find any in English. At his website they describe the basics of his methods: shifengshou.com Can anyone recommend a book with even the same ideas? I think this guy is supposed to be the original "human calculator," and if I'm going to invest time in learning a system, I want to learn the best.