Energy
Light, heat, food and electricity — follow energy as it travels and changes form, all the way back to the Sun.
学习路径——由浅入深
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Light
Where does light come from, and how does it help us see? Discover light sources and how light bouncing off objects reaches our eyes.
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Shadows
What is a shadow, and why does it form? Explore how light travels in straight lines and what changes a shadow's size and shape.
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Heat
What is temperature, and how is it different from heat? Measure with thermometers and discover the heat sources around you.
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Effects of Heat
Follow heat as it flows from hot to cold — faster through some materials than others — and see how gaining or losing heat changes things.
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Photosynthesis
Where does the energy in living things come from? Uncover how green plants use sunlight, water and carbon dioxide to make food.
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