Students explore the parts of the respiratory system in this six lessons unit. The lessons presnt the concepts of the breathing, the function of oxygen in the system, how sounds are made, and the effects of pollution, smoking and disease...

Fourth graders use local materials such as leaves and other plant matter; sand and pebbles to make soil. They plant seeds in the manufactured soil and in natural soil and then observe and record the results.

In 1901 a deadly smallpox epidemic tore through the Northeast, prompting the Boston and Cambridge boards of health to order the vaccination of all residents. But some refused to get the shot, claiming the vaccine order violated their...