🔬 The Microscopic World

What you’ll learn

1. A Window Into The TinyUnderstand what a microscope does and how Leeuwenhoek first revealed microscopic life.A microscope uses curved glass lenses to make tiny things look much bigger, opening a world too small for our eyes. Lenses bend light to zoom in, sometimes hundreds of times, and electron microscopes zoom in even further. Over 300 years ago, Antonie van Leeuwenhoek used handmade microscopes to become the first person to see bacteria and other tiny creatures he called animalcules.
2. A Drop Of Pond WaterExplore the single-celled creatures that live in pond water and how they move and eat.A single drop of pond water teems with tiny single-celled creatures. The paramecium swims using hair-like cilia, while the amoeba oozes on pseudopods and wraps around its food. Tiny plant-like algae make oxygen using sunlight, and the strange hydra catches prey with stinging tentacles and can regrow if cut in half.
3. The Life Inside YouLearn that the body is made of cells and that helpful bacteria live inside us.Every part of your body is made of trillions of tiny cells of many kinds, from muscle to nerve to blood cells. Billions of friendly bacteria in your gut, called the microbiome, break down food and fight bad germs. Bacteria are single-celled living things, and washing hands sweeps away hidden germs.
4. The Toughest Tiny CreaturesDiscover the tardigrade's toughness and how viruses differ from bacteria.The tardigrade, or water bear, is a tiny animal that can survive being frozen, boiled, dried out, and even sent to space. Viruses and bacteria are both tiny, but a bacterium is a living cell that acts on its own, while a virus must enter a living cell to make copies. Some microbes even thrive in boiling springs and deep ice, hinting that tiny life might survive in space.

Questions this course answers

Grounded in trusted sources

• Smithsonian National Museum of Natural History
• Natural History Museum, London
• American Museum of Natural History

Every Wunder lesson is built from real, reputable sources — never invented.

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