Scientists Say

A weekly word defined, in a sentence and in context.

  1. Ecosystems

    Scientists Say: Deforestation

    Trees slurp up carbon dioxide and help keep our planet cool. But deforestation cuts those trees down in large numbers.

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  2. Physics

    Scientists Say: Microgravity

    Gravity is a force that brings objects together. But when those objects get far away, the force feels small. It feels like microgravity.

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  3. Chemistry

    Scientists Say: Atom

    An atom is the smallest possible piece of a chemical element.

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  4. Ecosystems

    Scientists Say: Prairie

    Prairies are flat, fertile grasslands in North America. They are their own unique ecosystem.

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  5. Tech

    Scientists Say: GPS

    A GPS system relies on satellites orbiting the planet, constantly sending signals back to receivers on Earth.

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  6. Chemistry

    Scientists Say: Polymer

    Polymers can be natural or man-made, but they are all big molecules made up of smaller units linked together.

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  7. Life

    Scientists Say: Excretion

    Every living thing produces waste. Excretion is how organisms take out the trash.

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  8. Oceans

    Scientists Say: Tsunami

    This is a series of ocean waves triggered by an underwater earthquake or volcano. The event starts as small waves, but those waves can grow as they approach land.

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  9. Space

    Scientists Say: Spaghettification

    Black holes cram a lot of mass into a small area. When another object gets close, the black hole’s gravity can stretch it into a noodle-like strand.

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  10. Life

    Scientists Say: Protein

    Proteins are molecules made up of building blocks called amino acids. They play many key roles in the body’s cells and are essential for life.

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