If a man fell off a plane from an altitude of 10,000 ft, how long will it take for him to hit earth? Well, this is no joke. It is actually a mathematical problem which will take some old fashioned brain slogging to solve.

I have always been in awe of mathematical equations and how using the relevant formula you can explain and solve any problem. However, I am not good at remembering anything but for basic equations from school.

So, the other day, while discussing the rate of evaporation of water for an Olympic size pool with an architect, both of us realised that we had no clue which formula to use, after all this wasn’t one of those problems we were faced with everyday.

Carrying a scientific calculator all the time is not really a practical option. I still do carry one, but not everyone can, and the old scientific ruler is not really available anymore. So how do you get to remember equations, and what happens when you are stuck with a problem.

My immediate thought was to Google the problem, or maybe checkout Wolfram Alpha, the search engine making all the waves. Then I decided to check if Casio—I love their scientific calculators—has put something online, may be a formula search.

And it had. Since June 1, the company has made available its Keisan portal—Keisan means calculation in Japanese—and it was online at www.keisan.casio.com.

The architect and me, both science students, were enamoured by the number of mathematical equations on the site. From the trivial ‘When is Easter for a particular year’ to the serious Bessel functions and probability calculations, they were all there.

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