Scholastic
Study Jams! Add & Subtract with Common Denominators
RJ and Zoey are at camp and need to get back to the mess hall for lunch, but they don't know how far they have to walk. Help them figure out the distance while teaching young mathematicians how to add and subtract fractions with this...
Other
Seton Hall University: Johann Bernoulli (1667 1748)
A great biography of Johann Bernoulli is provided at this site. An audio clip is provided, as well as a good list of primary sources.