What is the importance of the Sun (solar energy)?
Importance of the Sun Do you see the Sun in the sky in the morning every day? Do you know the importance of the Sun? The Sun is the main source of energy on...
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Types of levers and the importance of each of them
People use levers but they do not know the type of them and how to determine the type of any lever, The levers are classified according to the location of the effort force, the...
Structure and the importance of the levers
The levers are the most common simple machines that help man to perform heavy tasks easily. They were first described in 260 B.C, The liver is affected by an effort force and a resistance...
Observing space and invention of Telescopes, Hubble telescope & Satellites
Astronomical telescope Who was the first scientist who made the astronomical telescope? ” Galileo ” was the first scientist who made an astronomical telescope in 1609. It was made from lenses to collect the...
