Lasers for Kids – How Do Lasers Work
The laser beam's energy is concentrated into a narrow width and is very powerful. Laser light can also be focused very accurately. Over this huge distance...
Category How staff work
Magic Tricks Revealed – Levitation
This illusion has mystified thousands of the theater-going public, in fact, it has been the “piece de resistance” of many illusion acts. The ordinary method of procedure is as follows: The person who is to be suspended in the air,…
How Many Days in Each Month – Easy Hand Trick
“Thirty days hath September, April, June, and November,” etc., and many other rhymes and devices are used to aid the memory to decide how many days are in each month of the year. Herewith is illustrated a very simple method…
How does a light bulb work – for kids?
How does a light bulb work – for kids? Have you ever looked closely at an ordinary electric light bulb? Hold it carefully while you do so. Inside, you may see wire “legs” holding up a thinner wire arranged in…
Acupuncture – How Does Acupuncture Work?
Acupuncture is an ancient Chinese method of relieving pain and treating disease. The procedure involves the insertion of needles into various parts of the body. Acupuncture has been used to treat conditions such as: asthma, deafness, migraines, ulcers, eye diseases,…
What is a polygraph test and How does a lie detector work?
The polygraph – device for detecting a lie is one of the tools in a criminal investigation and is used by the police in many countries. However, the data obtained using this device is not accepted everywhere as direct evidence…
How is geothermal energy produced and how do we recover it? – 4 kids
Do you know what it is like at the center of the earth? It is very, very hot. The temperature is thought to be about 13,000 °F (7000 °C), which is hot enough to melt rock. The heat spreads to…
HOW DOES TIDAL POWER WORK?
Have you ever watched the sea during a storm? The waves crash down with enormous energy. Sometimes they are strong enough to damage seaside walls and buildings, or even make cliffs crumble. Do you know how we can make use…
HOW DOES WIND POWER WORK?
The wind has been a source of energy for thousands of years. Before the development of the steam engine, most ships relied on wind power to fill their sails and push them along. Windmills were used to turn grindstones and…
HOW SOLAR POWER WORKS?
More energy reaches earth from the sun than could be converted by millions of power stations. The sun’s energy costs nothing, but how can we use it?We can use the sun’s energy to heat the water in our homes. One…