What is Tenacity – Tenacity is a term used to express the resistance which the body opposes to the separation of its parts. It is determined by forming the metal into a wire, and hanging on weights, to find how…
What to do During a Tornado - Tornado Safety rules - While different kinds of storms bring different kinds of danger, some basic safety rules apply to all storms. To be safe you should learn what kinds of storms affect the area where you live or are visiting, and you should become familiar with the safety rules for those storms.
The ancient Egyptians were the first to accurately measure the length of the year. They knew that the best time for sowing is immediately after the Nile...
Can you imagine a time when people did not use numbers?The first people on earth lived by hunting wild animals and collecting wild fruit and nuts.They had no need to count.Numbers did not matter to them.But then, about 11,000 years…
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…
Dead animals and plants rot and decay. In swampy areas, for example, dead plants fall into the water. As they decay, they give off gas. Scientists call this biogas. Biogas comes from garbage, sewage, and manure, too. Biogas is a…
The Geothermal energy is renewable, clean and sustainable energy generated from the Earth’s heat, which is constantly replenished. At the center of the earth, it is very, very hot. The temperature is thought to be about 13,000 °F (7000 °C),…
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…
What is Nuclear energy Nuclear energy is the most powerful form of energy in the universe. What is nuclear fission and nuclear fusion There are two ways of producing it and both ways release enormous amounts of energy. One way…
How old is a lump of coal? This sounds like a trick question, but it isn’t. Coal is millions of years old. Anthracite, the oldest and hardest coal, is 400 million years old. All those years ago, many parts of…