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 matters." The results place Maxwell's equations of electromagnetism and the Euler equation at the top. Some of the criteria that readers used for selecting their favorites include simplicity, practicality, and historical relevance.