Science
- 521
- List of Physicists
- A Wikipedia page which displays in alphabetical order links to biographies of the most famous physicists in history.
- 522
- Niels Bohr
- Information about his life, contributions to physics, and theories. Reference books and links to websites of interest.
- 523
- Engineering for Earthquakes
- Practice making bridges that are strong enough to withstand earthquakes. Page includes background information about earthquakes in general.
- 524
- Bridge Basics - A Spotter's Guide to Bridge Design
- Pictures, history, and structural explanations of many different types of trusses and bridges.
- 525
- Bridge Designer
- This free program allows you to design a virtual truss, and then put a load on it. It will show you how the load is spread throughout the truss.
- 526
- Bridging the Bay
- An online exhibit of the bridges in the San Francisco Bay area. Includes statistics, history, and facts about each of the six bridges. Also includes a section on unbuilt projects.
- 527
- Fact Monster: Notable Modern Bridges of the World
- Statistics about a handful of bridges, including name, location, length of span, and year completed.
- 529
- How Bridges Work
- Review of how the forces act on different types of bridges. Includes photos of real bridges.
- 530
- Energy Hog: Hog Busters Training Camp
- Play games like Fridge Frenzy, Bulb Hunter and Whack a Hog and learn how to save energy around your house.
- 531
- Animated Engines
- Animated pictures help explain the inner workings of a variety of steam, Stirling, and internal combustion engines.
- 532
- Simple Machines
- Gives real-life examples of the six simple machines, plus an easy quiz, and links.
- 533
- Simple Machines
- Explains simple machines such as levers, gears and pulleys with text, pictures and animations.
- 538
- An Introduction to Microscopy
- Includes sections on the history of the microscope, and various creatures you can see with one, including: tree, insects, and microscopic pond life.