Moving along with our top science apps (we first showed you the best iOS math apps), now it’s time to clear some of the mystery surrounding the great laws of physics. These have plagued students ...

From finance to physics, Calculator Soup has it all. We all have a few go-to calculations that we find ourselves doing often, like converting ounces to cups or miles to kilometers—that sort of thing.

Math whiz Wim Klein, born a century ago, moved physics forward with his calculations as computer developers worked to catch up with him. An audience member yelled: “35, 27, 42, 41.” Wim Klein chalked ...