Science
Who was Yuri Gagarin
Yuri Gagarin was born on March 9, 1934, near Gagarin, Russia. He was the Soviet cosmonaut who became the first person to travel in the space in 1961.…
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Science
How Electric Currents Make Magnetic Fields
An electric current must flow through an electromagnet if the magnet is to work. The current makes the magnetic field. The Field of an electromagnet …
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Science
What are Elements?
Chemical Symbols We have seen that there are more than 100 different elements (including those that have been made in laboratories). Chemists use a…
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Science
What Are Magnetic Poles
Magnets attract magnetic materials. There is a magnetic force which pulls on a piece of steel when a magnet attracts it. You may have noticed that th…
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Science
The Spectrum of White Light
Sometimes, if it rains and the Sun shines at the same time, you may see a rainbow. You have to stand with your back to the Sun; you will see an arch …
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