Scientists Say

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

  1. Brain

    Scientists Say: Haptic

    Haptic is an adjective used to describe things related to our sense of touch.

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  2. Physics

    Scientists Say: Plasma

    In physics, plasma refers to one of the four states of matter. In medicine, plasma describes the part of blood that ferries cells, nutrients and more throughout the body.

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  3. Materials Science

    Scientists Say: Aerosol

    Aerosols are tiny bits of solids or drops of liquids suspended in gas. Aerosols include mist, fog and soot, as well as pollution from fossil fuels.

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  4. Chemistry

    Scientists Say: Oxidation and Reduction

    Oxidation and reduction are two parts of a chemical process in which one atom steals electrons from another.

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  5. Physics

    Scientists Say: Mass

    Mass shows how much an object resists speeding up or slowing down when force is applied — a measure of how much matter is in it.

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  6. Health & Medicine

    Scientists Say: Nicotine

    Nicotine is an addictive substance found in tobacco plants. It's what makes it so difficult to quit smoking or vaping.

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  7. Chemistry

    Scientists Say: Bond

    In chemistry, this attachment between atoms forms because of the power of attraction. Chemical bonds make up every solid object on Earth.

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  8. Plants

    Scientists Say: Pollen

    Pollen is a mass of tiny reproductive cells. These grains combine with egg cells to form seeds — but on the way, they can make some people miserable.

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  9. Chemistry

    Scientists Say: Metal

    Metals are substances that can be elements, alloys or compounds. They all conduct heat and electricity and can be formed into different shapes.

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  10. Life

    Scientists Say: Genus

    A genus is a group of closely related species. It’s the first part of the two-part system called binomial nomenclature, used to name living things.

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  11. Chemistry

    Scientists Say: Alkaline

    Alkaline chemicals are basic — substances that produce hydroxide ions in solution.

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  12. Math

    Scientists Say: Pi

    Pi is the ratio of a circle’s circumference to its diameter. But some mathematicians say life would be easier if we used a different ratio instead.

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