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archimedes principle - why do ships float..mp4
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archimedes principle - why do we weigh less in water..mp4
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are einsteins gravitational waves real..mp4
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atmospheric refraction - why do stars twinkle..mp4
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buoyancy - can you drown in the dead sea..mp4
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can we travel faster than light..mp4
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concave mirror - why is your reflection upside down on a spoon..mp4
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convex lens - can a magnifying glass burn paper..mp4
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density - why do firemen crawl in smoke filled rooms..mp4
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density - why does an iron nail float on mercury and sink in water..mp4
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diffusion - why can we smell hot food from a distance..mp4
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earthing - why do buildings have lightning rods..mp4
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forced vibrations - why does a guitar have a hollow box..mp4
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frequency - why do women have shriller voices than men..mp4
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friction - why is it difficult to pull a boat on the beach than on the sea..mp4
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gravitational force - why do you weigh less on the moon..mp4
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gravity - why are planets spherical..mp4
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has the bermuda triangle mystery been solved..mp4
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how do chameleons change color..mp4
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how do glasses work..mp4
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how do igloos keep you warm..mp4
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how do microwave ovens work..mp4
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how do stars form..mp4
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how do straws work..mp4
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how do x-rays work..mp4
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how does a plastic comb attract paper..mp4
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lateral inversion - why is ambulance written in reverse..mp4
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lunar eclipse - why does the moon turn red..mp4
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newtons 3rd law - why does a swimmer push the water backward..mp4
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refraction of light - why does a pencil look bent in water..mp4
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resonance - how does sound break glass..mp4
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specific heat of water - why is water used in hot water bags..mp4
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surface tension - why are drops spherical..mp4
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wavelength - why red is used as a danger signal..mp4
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what causes earthquakes..mp4
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what happens if a plane is struck by lightning..mp4
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what is a black hole..mp4
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what is a mirage..mp4
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what is a tsunami..mp4
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what is fracking..mp4
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what is the big bang theory..mp4
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why are airplane windows round..mp4
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why are auroras formed..mp4
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why are cloudy nights warmer than clear nights..mp4
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why are planets spherical..mp4
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why are sunsets red. 【 微信 funenglish4kids 】.mp4
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why are two thin blankets warmer than one thick blanket. 【 微信 funenglish4kids 】.mp4
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why cant we hear sound in space. 【 微信 funenglish4kids 】.mp4
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why cant you use phones on planes. 【 微信 funenglish4kids 】.mp4
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why did pirates wear eye patches. 【 微信 funenglish4kids 】.mp4
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why do comets have tails..mp4
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why do heavier objects fall faster..mp4
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why do pop rocks pop..mp4
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why do stars seem higher than they actually are..mp4
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why do we have different time zones..mp4
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why do we have seasons..mp4
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why do we hear echoes..mp4
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why do we see lightning before thunder..mp4
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why do we see only one side of the moon..mp4
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why do we use a black umbrella in summer..mp4
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why do we weigh less in water..mp4
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why do women have shriller voices than men..mp4
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why do woolen clothes keep us warm..mp4
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why does a match light when you strike it..mp4
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why does february have 28 days..mp4
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why does hot air balloon float..mp4
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why does ice float..mp4
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why does our recorded voice sound different..mp4
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why does popcorn pop..mp4
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why does saturn have rings..mp4
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why does sound travel faster in summer than in winter..mp4
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why is a convex mirror used as a rear view mirror..mp4
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why is a laboratory thermometer not used to check body temperature..mp4
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why is glass transparent..mp4
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why is it difficult to cut with a blunt knife..mp4
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why is it easier to burn dry leaves but not green leaves..mp4
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why is nuclear fusion not used to generate electricity..mp4
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why is snow white..mp4
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why is space black..mp4
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why is the ocean blue..mp4
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why is ultrasound used in sonar..mp4
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