Precipitation. Drizzle, rain, snow and sleet are several of the different forms of precipitation.

Northeast. Estuaries are a transition zone between river environments and ocean environments.

7 Miles Per Second. 7 miles per second is equal to 25,000 miles per hour.

Erwin Chargaff. James Watson and Francis Crick discovered the double helix, while Erwin Chargaff's rule that A=T and C=G helped lead to this discovery.

Coulomb's Law. Coulomb's Law describes the force between two charged particles.

Polluted Watersheds. Watershed pollution is called "NPS" - nonpoint source pollution.