Topics from January 2017
- What is alternative energy?
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- Why is water important for life?
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- Why does ice float?
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- Why is water wet?
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- Why do we feel cold when the body is wet?
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- Why do water striders not sink?
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- Why do container ships not sink?
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- What is hydropower?
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- How does a watermill work?
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- How is electricity generated by using a dam?
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- How energy is obtained from high and low tides?
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- How does a ferry work without an engine?
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- How are bubbles formed in boiling water?
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- What is Heron’s ball?
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- Who invented the first steam engine?
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- How do paddle steamers work?
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- How does a modern steam turbine work?
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- Why do potatoes cook faster in pressure cookers than in a normal vessel?
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- What happens during burning?
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- How does a candle burn?
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- How is a fire caused?
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- How does water extinguish fire?
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- How does a diesel engine work?
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- What are fossil fuels?
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- How is coal formed?
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- How is oil discovered?
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- How does oil reach us?
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- What is natural gas?
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- How is petrol obtained from crude oil?
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- How do bats orient themselves with ultrasounds?
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- What is an echo?
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- What are ultrasonic waves?
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- Why does a police car siren change pitch when it passes us?
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- What happens when an aircraft breaks the sound barrier?
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- Why do humans see colours, but dogs do not?
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- Why can people see better with spectacles?
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- How is a rainbow formed?
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- What is refraction?
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- What is light?
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- How do electric fuses work?
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- Why don’t birds sitting on a high-voltage wire get a shock?
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- What is the difference between direct current and alternating current?
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- What is a substation?
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- What is electrical current?
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- How does electricity get to our homes?
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- What are the different types of energy resources available on the Earth?
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- How do geothermal power plants work?
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- Can the Earth’s heat be used for other purposes?
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- What is biogas?
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- How is glass manufactured?
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- What is porcelain made of?
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- What is an ore?
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- Why are diamonds expensive?
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- How do windmills work?
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- How can we use wind power?
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- Why do large wind wheels have three rotor blades?
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- What does ‘sailing at high wind’ means?
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- What are ‘horse latitudes’?
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- How does wind shape nature?
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- How do aircrafts fly?
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- How does a hot-air balloon float in air?
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- How does a propeller work?
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- How is electricity generated from solar energy?
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- How can we capture the heat energy of the sun?
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- How does a solar cell work?
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- Why solar plants are not located everywhere?
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- What is a ‘solar sail’?
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- What is a magnetic sail?
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- How is energy obtained from atoms?
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- What forces keep the atomic nuclei together?
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- What is radioactivity?
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- What is a chain reaction?
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- How do atomic power plants work?
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- Why atomic power plants are considered dangerous?
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- How can we save resources for future generation?
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- What are natural resources?
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- Is nature the greatest treasure of the Earth?
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- Why do people fight for water?
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- Why are quality seals important?
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- What is aurora?
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- What causes the Earth’s magnetic field?
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- Why does the compass needle always point to the north?
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- How does a bottle opener work?
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- Why do we crouch down to lift a heavy box?
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- Why is it difficult to move heavy furniture?
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- What is a pulley?
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- Why do mountain passes have serpentine roads?
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- Why do astronauts wear spacesuits?
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- Why don’t satellites fall to the Earth?
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- What is mass, weight, and density?
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- Why do objects fall to the ground?
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- What is a chemical reaction?
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- What is a gas?
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- What is an element?
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- What is an atom?
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- What is the composition of air?
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