It is true that electronics developed from the study of electricity. Early ideas about the way electric current could flow through conductors and through a vacuum led to the development of useful radio systems and telephones. It was possible to send messages with what was, by today's standards, incredibly simple and crude equipment. The Second World War provided an urgent requirement for more 2 sophisticated communication and other electronic systems. The invention of radar required a big step forward in theory and even bigger step forward in engineering. The study of electronics gradually became an important study in its own right, and the radio engineer became a specialized technician The post-war development of television led to one of the most massive social changes that have ever taken place: many households became the owners of televisions, as well as radios and record players. In some branches of industry, electronic systems were regarded as useful, but electronic systems not directly concerned with wireless or television were still unusual. Only in the early 1960s did electronics technology really come of age', thanks to the work of three scientists working in the Bell Laboratories in the USA: Bardeen, Brattain, and Shockley. In 1957 they assembled the first working transistor

The first working transistor was developed

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Animals are smarter than human.
Animals have certain instincts that human doesn't prossess.
By running around the house, they can feel the vibrations.
Human doesn't know where to look.
An animal has sharper ear than human.
Created: 3 years ago | Updated: 3 months ago
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Some animals may be able to sense and approaching earthquake.
By observing animal behavior, scientists perhaps can predict earthquakes.
The Chinese have successfully predicted an earthquake and saved many lives the quake.
All birds and dogs in a ten-kilometer radius of the epicenter went wild before the quake.
The Chinese Government was able to evacuate millions of people and thus keep the death toll at a lower level in 1976.
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Created: 3 years ago | Updated: 3 months ago
Updated: 3 months ago
Flying outside the window, he grabbed the papers.
Flying out of the window, he grabbed the papers.
Flying the window, the papers were grabbed him.
Flying out the window, the papers grabbed by him.
Flying out the window, the papers were grabbed by him.
Created: 3 years ago | Updated: 6 months ago
Updated: 6 months ago
Let the grass be keep off
Let keep off the grass
Do not keep of the grass.
The grass should be keep off
You are requested to keep off the grass
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