AdLit
Ad lit.org: Reading Discussion Guide: The Sea of Trolls by Nancy Farmer
In A.D. 793, eleven-year-old Jack leaves his family farm to become an apprentice to the Bard, a druid from Ireland, who is assigned to his Saxon village. At first, he is unsure of his duties, and is puzzled when the Bard experiences a...
PBS
Pbs: The Lowdown: Exploring Changing Obesity Rates Through Ratios and Graphs
In these KQED Lowdown infographics, explore how adult obesity rates in the United States, as measured by body mass index (BMI), have dramatically changed in the past half-century. A circular graph and a pictograph depict data by decade,...
Wolfram Research
Wolfram Math World: Hyperbolic Functions
This site from MathWorld explains the hyperbolic function. The information is not too in-depth, but factual and quite a few links are provided for additional information on related subjects.
Math Open Reference
Math Open Reference: Semicircle
A handy reference guide to semicircles. It provides definitions and examples that enhance further explanation. Includes links to related topics.