Explains the "trick" to "work" word problems (such as two people painting a room, or two pipes filling a tank), and demonstrates how to set up and solve these exercises.

Learn about Ed Adams and his invention of 'Mobile Gas Tank Leak Testing Technology'.

Investigate how scientists track the world's most valuable and endangered fish. Define the range of an individual based on observations made over the course of a day.

Melissa Kaplan explains how to set up a tank for a salamander. She tells how to select a salamander and what kind of ailments to watch for.

GPR can detect underground features such as abandoned mines or hazardous waste tanks. This is a commercial site for a company that uses this technology, but it offers pictures and information on what's possible.

An activity to demonstrate how light behaves when encountering an obstacle, in this case, wax blocks placed in a ripple tank. Includes an explanation of the diffraction that occurs.

This question and answer site solves a volume problem for a triangular tank.

Provides brief descriptions of German tanks used in WW2.

Basic design of a demonstration machine that will lower the vapor pressure and cause water to evaporate at room temperature.

A game that showcases the inventive genius of Leonardo da Vinci, who made drawings of helicopters, planes, and tanks long before these machines ever became modern-era realities. Have fun learning about Leonardo's many ideas while you...

If you have ever had a fish tank, you have owned an operating siphon. A siphon is a handy device for emptying out a liquid reservoir that has no drain. As a result, they are great for cleaning fish tanks. Liquid in a siphon flows...

Have you ever dreamed of a world where you could take the scraps from last night's dinner and toss them into your car's fuel tank and make gas? Well, we're not quite in "Back to the Future" yet, but in this energy science fair project,...

A biography of James A. Baker, III, with links to speeches and interviews, and to think tank reports on political and world issues.

The National Center on Addiction and Substance Abuse at Columbia University offers a unique think/action tank that engages all diciplines to study every form of substance abuse as it affects our society. The site organizes and provides...

The Tippy Tap hand-washing station is an inexpensive and effective device used extensively in the developing world. One shortcoming of the homemade device is that it must be manually refilled with water and therefore is of limited use in...

Students investigate the endothermic reaction involving citric acid, sodium bicarbonate and water to produce carbon dioxide, water and sodium citrate. In the presence of water [H2O]; citric acid [C6H8O7] and sodium bicarbonate [NaHCO3]...

Since the 1970s, Americans have witnessed an amazing number of safety improvements in automobiles and the driving environment. Seat belts, air bags, safer fuel tanks, the Jaws of Life, and driving while intoxicated (DWI) campaigns are...

This site contains a challenge for students to engineer a sensor that can detect how much fuel is in your tank. The site also contains tips, a lesson plan, and a place for students to document their engineering design process.

In this game, pick a car, fill up the tank with fuel using two units at a time, race your car, and see who wins.

Students use simple materials to design and make model sailboats that must stay upright and sail straight in a testing tank.

Explains the types of solar water heaters a home can have. These include a passive system, an active system, and a solar collector, as well as the need for a storage tank. It also gives tips on how to get the best use from a solar water...

A light-hearted and informative section about the role of microorganisms in decomposing human waste. It has a colorful, clickable graphic aiding in navigation of the site. Fun and informative.

Basics of space shuttle operations are explained, including details of launch vehicle and orbiter configuration. Information on each shuttle Enterprise, Columbia, Challenger, Discovery, Atlantis, Endeavour is included. Has video and...

An in-depth look at the risks of using anhydrous ammonia as an agricultural fertilizer. Provides plenty of safety and equipment information, as well as exposure, transport, and storage guidelines.