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What is the galaxy?

There is probably nothing more mysterious and surprising than "galaxies" (also known as the galaxy) in the sky. it is like a string of...

The brightest star?

The star that you see the brightest in the sky is not the brightest. And the star you have just seen is dim, don't...

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...

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....
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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...