
Types of Microscopes
Maya and Arjun look at a drop of pond water with Mrs. Patel and discover how simple and compound microscopes help us see a tiny world of microorganisms that is invisible to our eyes.
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Maya and Arjun look at a drop of pond water with Mrs. Patel and discover how simple and compound microscopes help us see a tiny world of microorganisms that is invisible to our eyes.

During Science Fair Week, Lila and Jay discover a forgotten sandwich covered in fuzzy patches. With help from Ms. Rivera and a microscope, they explore the invisible world of bacteria—how these tiny living things grow, why some spoil food, and how we can stay healthy.

When a neighborhood pond turns bright green, two curious kids and Grandma June discover tiny algae, what causes algal blooms, and why too much algae can harm lake life.
Some plants, like beans and peas, work with helpful bacteria that live in bumps called nodules on their roots. These bacteria turn nitrogen gas from the air into a form plants can use. This process is called nitrogen fixation. It helps plants grow strong and returns nitrogen to the soil for other plants.
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