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The speed at which sound travels from one place to another depends upon the medium and how closely packed the molecules are in the matter. Learn more about how sound travels from the simulation.
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A wave is energy in motion or energy moving from point to point. To describe the traits of a wave, there are a few terms you need to know. Choose a term in the activity to display its description in...
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Learn the common causes of household odors.
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As you take a deep sniff, the odor particles in the air flow back to the top of your nose. Learn more about the sense of smell in the simulation.
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The Sun is a natural source of visible light waves. Our eyes see the reflection of the sunlight off the objects around us. Check out the simulation to learn more about scattering light.
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In the activity, choose a color to find out why objects appear in a particular color.
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The Earth is surrounded by a thin envelope of gases called the atmosphere. More than 500 active volcanoes erupt around the world affecting the Earth's atmosphere and global climate.
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These brain teasers can help you develop your creative thinking, an important skill for inventors. Try out the brain teaser game.
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Use the arrows to scroll the timeline to discover inventions. Click on an event for more details.
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Play a science word jumble game. Scramble the word jumbles by dragging each letter into the appropriate box.