hearing aid

Hearing Aid – In 1898, American engineer Miller Reese Hutchinson patented the world’s first battery-powered hearing aid. Today’s models are … More

heart valve

Diseases of the heart and circulatory system are a leading cause of death in the U.S. and a leading area … More

head protection

When you bike, board, or play ball, you wear a helmet. But do you know how helmets work? ‘Smart’ football … More

hand crank generator

Crank up some electricity How much electrical power can You generate Turn the crank and push and hold the switches … More

hands-on circuits

There are so many great ideas for hands-on electrical circuits projects, we needs a separate place to put them all… … More

healthy babies

What’s the problem? 2017.12.30 Engineers Without Borders USA There are many unknowns when bringing a new baby into the world. … More

greenhouse

garden variety Greenhouses convert solar light to heat, enabling year-round production and the growth (in enclosed environments) of specialty crops … More

gunpowder, guns, firearms

Gunpowder, 10th century – Outsourced killing to a machine |firearm – a portable gun, being a barreled weapon that launches … More

hand tools

Engineering is about problem solving. Many of life’s little problems can be solved by an engineer with the right tools. … More

gyroscope

Gyroscope – The device is a spinning wheel on an axle. The device, once spinning, tends to resist changes to … More

hand battery

The hand battery To do and notice Put your left hand on the aluminum plate and your right hand on … More

gumball machine

Gumball machines History of gummbals – around 215 BC. the first vending machines were located in Egyptian temples and dispensed … More

Great Wall of China

Great Wall of China – a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally … More

green plastic

“Green” means environmentally friendly and sustainable. Green chemistrycreates products and processes that are safer and cleaner — from the start. … More

greatest…

There are plenty of lists of Greatest… Here are some of the lists. There are many duplicates and items that … More