Riley, I like integrals. {{CMD_7}} I feel fancy when I make an integral sign. {{CMD_8}} I know! An integral computes the signed area between a curve {{MATH_9}} and the {{MATH_10}}-axis. But why {{CMD_11}}signed{{CMD_12}} area? Maybe we should just compute plain old area. {{CMD_13}} Makes sense to me! {{CMD_14}} Unless{{CMD_15}} maybe there are other applications where ``signed'' area makes more sense. {{CMD_16}}