Dr. Martin Luther King, Jr.'s "Letter from Birmingham Jail" serves as an exemplar for a mini-lesson on semicolons. Working alone or in small groups, class members first circle all the semicolons in the letter, and then consider how this...

This site from MathWorld is a good site explaining Green's Theorem. The information presented is fairly brief but very helpful, and several formulas and examples are given along with links to additional information.