Scientists Say

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

  1. Physics

    Scientists Say: Fusion

    Nuclear fusion is the physics that powers the sun and could someday provide abundant clean energy on Earth.

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  2. Physics

    Scientists Say: Fission

    Nuclear fission is the process of splitting atoms apart to release huge amounts of energy.

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  3. Computing

    Scientists Say: Artificial intelligence

    Artificial intelligence is technology smart enough to do tasks that would normally require human brainpower.

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  4. Health & Medicine

    Scientists Say: Infection

    Infections range from mild illnesses, such as the common cold, to deadly diseases, such as rabies.

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  5. Earth

    Scientists Say: Drought

    A drought is a shortage of rain or snow in a particular area.

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  6. Chemistry

    Scientists Say: Fluorescence

    This property causes materials — including some animals’ skin, fur or feathers — to glow under light.

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  7. Brain

    Scientists Say: Glymphatic System

    The glymphatic system bathes the brain in cleansing fluids during sleep and clears away harmful cellular waste.

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  8. Math

    Scientists Say: Mean, median and mode

    Mean, median and mode are all different ways to describe the middle value in a dataset.

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  9. Space

    Scientists Say: Astronaut

    Astronauts have been going to space for over 60 years.

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  10. Physics

    Scientists Say: Neutron

    Neutrons are one of the main building blocks of atoms and have no electric charge.

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  11. Earth

    Scientists Say: Pole

    A pole is either of two opposite ends of a molecule, magnet, battery, planet or other object.

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  12. Plants

    Scientists Say: Fruit

    Some foods usually called vegetables — such as tomatoes, cucumbers and peppers — are actually fruits.

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