City streets Human factors Traffic signal lights need to warn as many people as possible. Many people, particularly men are…

Submarine – a vessel that goes under water. Most large submarines are war vessels. Some small ones are used for…

Stonehenge – a prehistoric monument located in the English county of Wiltshire, near Salisbury. One of the most famous prehistoric…

Stethoscope – a medical device for listening to the internal sounds of an animal or human body. It is often…

steam engine – a heat engine that performs mechanical work using steam as its working fluid. Steam engines are external…

Stop motion animation is a film making technique that makes inanimate objects appear to move on their own. Think Gumby…

Statics is concerned with the analysis of loads (force and torque, or “moment”) on physical systems in static equilibrium –…

Star fort – fortification layout specifically designed to resist attack by cannon. The structure is composed of many triangular bastions,…

Steel is an alloy of iron and other elements, including carbon. The following elements are always present in steel: carbon,…

stained glass is glass that has been colored by adding metallic salts during its manufacture. The colored glass is crafted…

Sputnik 1 In the 1950s the United States and Russia were working to open the next frontier – space. Once…

Robert Hooke (1625 – 1703) was employed as an assistant to Robert Boyle, for whom he built the vacuum pumps…

Olympics swimming – fast pool design, backstroke improvements for swimmer Missy Franklin Composites are becoming a favorite in many sports…