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What is a shooting star?

Since thousands of years ago, seeing a meteor, people have wondered in amazement: what is it? Where is it from? and man has believed...

What is a comet?

There was a time when people considered comets' appearance as signs of great natural disasters, epidemics, great war, or death. Humans have a better idea...

Which ocean is the deepest?

In many ways, the oceans still keep secrets from us. Just like the age of the ocean is how much we do not know....

What is ocean current?

A sea current is a flowing stream of water right above the ocean's surface. And also, underground ocean currents are flowing in the ocean....

Why does seawater taste salty?

Salty seawater is natural. But why is it salty, and where does ocean salt come from? We know salt is a substance that can dissolve...
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What is color television?

The human eye sees an object and can see its colors because the light it emits, or light from its surface, bounces off, enters...

What is an audio CD?

Edison's phonograph underwent constant innovation to become a popular electric phonograph. It is made up of the motor, the turntable, the receiver, and the...

What is the principle of the fire detector?

Fire harms human lives and property, damages the ecological environment. Fire prevention is a matter of concern to all humans. If it is possible...

What is the principle of the theft alarm?

In important places such as money, gold, silver, underground record storage, etc., if a fraudster suddenly sneaks in. the burglar alarm will immediately sound...