Critical Point is a feature of the online version of the magazine Physics World. The article posted here, by philosopher and historian Robert Crease, revisits "the greatest equations ever." He presents the results from his survey of readers in which he asked for a short list of nominations for great equations and "to explain why their nominations belonged on the list and why, if at all, the topic...

QuickMath is one of the most useful sites for common but tedious mathematical calculations. It is a free "online calculator that solves equations and does all sorts of algebra and calculus problems." Separated into many different functional sections, this handy tool can simplify expressions, evaluate symbolic integrals, plot equations, and much more. When inputting a problem into QuickMath for it...