Curated OER
ABChain Gang - C
High schoolers can hone their research skills by exploring the Internet to find the answers to the trivia questions presented in this on-line worksheet. This resource focuses on questions that have the letter "C" in them, such as;...
Wikimedia
Wikipedia: Carl Sagan
This encyclopedia article from Wikipedia provides a brief biography of Carl Sagan, the American astronomer who pioneered exobiology and promoted the Search for Extraterrestrial Intelligence (SETI), and science in general.