Dr. Marc's Amazing Facts
The Space Place, sponsored by NASA, has facts put together by Dr. Marc Rayman.
NeuroLab Space Trivia
This list includes questions and answers about historical missions, space exploration, shuttle missions, extravehicular activity, and space food.
European Space Agency
This site gives information about Europe's involvement with the ISS and other space exploration.
The Astronaut Connection
Biographies of Astronauts from around the world are what make this site unique.(site is currently under construction, hopefully it will be back soon!)
Questions
List of questions and answers put together by NASA's Life Sciences Data Archive. This link takes you to their Just for Fun page with more activities.
Educator's Activity Guide
This is a 1.2 MB PDF file that has several hands on experiments and activities designed for grades 6 through 8 by NASA's Kennedy Space Center. This page Educational Resources provides links for other grade levels.