Scientists Say

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

  1. Math

    Scientists Say: Variable

    A variable is something that can be changed — such as a value in math, or a factor in an experiment.

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  2. Earth

    Scientists Say: Atmosphere

    An atmosphere is an envelope of gas around a planet, dwarf planet or moon.

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  3. Space

    Scientists Say: Constellation

    Constellations are clusters of related things, especially the stars that form patterns in the night sky — some of which date back to ancient times.

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  4. Animals

    Scientists Say: Migration

    Migration involves the movement of animals or people from one place to another.

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  5. Chemistry

    Scientists Say: Inorganic

    Inorganic molecules include salts, minerals and other compounds that lack organics’ carbon-hydrogen bonds.

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  6. Physics

    Scientists Say: Doppler effect

    The Doppler effect is a perceived change in the frequency of light or sound waves due to the wave source moving relative to an observer.

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  7. Math

    Scientists Say: Equation

    An equation states that two groups of numbers or variables are equal to each other.

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  8. Computing

    Scientists Say: Machine learning

    Machine learning allows computers to learn new skills without programmers having to write out step-by-step instructions.

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  9. Life

    Scientists Say: Cellulose

    Cellulose is an abundant natural polymer found in plants and algae. It’s used to make everything from paper to clothing.

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  10. Earth

    Scientists Say: Richter Scale

    The Richter scale and other magnitude measures reveal the strength of an earthquake.

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  11. Physics

    Scientists Say: Dark Energy

    Dark energy is the unknown force causing the universe to expand faster and faster.

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  12. Life

    Scientists Say: Eukaryote

    Eukaryotes are living things whose cells package their genetic material inside a pouch called a nucleus.

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