A&E Television
History.com: The World Trade Center's Construction: 8 Surprising Facts
The twin 110-story towers at the heart of the World Trade Center were designed to surpass New York's iconic Empire State Building -- then the world's tallest building. Building the new towers would marshal unprecedented levels of design...
Stanford University
Stanford University: Conventionality of Simultaneity
This site from Stanford University is on the topic of simultaneity in relativity.
Carnegie Museum of Natural History
Carnegie Museum of Natural History: Hillman Hall of Minerals and Gems
Hillman Hall of Minerals and Gems offers an opportunity to explore a variety of ores, metals, gems, and other specimens displayed at the Carnegie Museum of Natural History. This resource offers an excellent collection of photos for...