Systems
Plants, your body and electrical circuits are all systems — parts that work together to do a job. Find out how each part helps.
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Plant System
A plant is a system: roots, stem and leaves each have a job. Find out what every part does, and how the same parts look different across plants.
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Human Systems
Meet the systems that run your body, then follow your food through the digestive system — mouth, gullet, stomach and intestines — step by step.
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Plant Transport System
Discover the tiny tubes inside a plant: one set carries water from the roots, another carries food from the leaves.
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The Human Respiratory and Circulatory Systems
Take a breath and follow the oxygen: through your nose, windpipe and lungs, then around your whole body in the blood.
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Electrical Systems
What is a simple electric circuit? Build one with a battery, wires and a bulb, test conductors and insulators, and draw circuit diagrams.
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Simple Series and Parallel Electric Circuits
Add batteries and bulbs in series or parallel and see how the current changes — then learn to use electricity safely and wisely.
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