Topics from June 2017
- Can air be converted into a liquid?
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- How does soap clean things?
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- How does an electron microscope work?
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- How does a Photostat machine work?
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- What is solar energy?
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- How do we take a photograph with a camera?
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- What is a dry cell?
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- How does an airconditioner work?
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- How does a refrigerator work?
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- How does a vacuum cleaner work?
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- What are laser beams?
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- What is a lie detector?
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- What are holograms?
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- How does a fluorescent light work?
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- What is a planetarium?
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- What are cosmic rays?
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- What are communication satellites?
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- Who was the first man to land on the Moon?
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- How does a tape recorder work?
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