PBS
Pbs Teachers: Earth Day: What We Do Adds Up
Explore averages and rates of change and apply to calculate the cumulative effect of garbage thrown out by people over time. Use population data from the U.S. Bureau of Census to estimate how much garbage your county threw away during...
Enchanted Learning
Enchanted Learning: All About Space: Mercury
The planet Mercury is profiled with information about its size, mass, atmosphere, length of day, and the like. Features include interactive activities and learning exercises.
Other
The Origin and History of the English Language
How many native English speakers are there in the world today? Learn important facts and statistics about the English-speaking world as well as a history of the language from its Germanic beginnings to the present.
Smithsonian Institution
Encyclopedia Smithsonian: Facts About the United States Flag
Facts and statistics are presented about the United States flag from 1777 to the present.