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Light tool measures activity inside living brain cells (Level A1) — a close up of a jellyfish in the dark

Light tool measures activity inside living brain cellsCEFR A1

28 Dec 2025

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Adapted from Brown University, Futurity • CC BY 4.0

Photo by Maxence Pira, Unsplash

Level A1 – Beginner
2 min
81 words
  • Researchers made a new tool that uses light.
  • It measures activity inside living brain cells.
  • The tool makes light inside the cells themselves.
  • The light comes from a small chemical reaction.
  • No bright external light is needed for recording.
  • This reduces damage to the cells during study.
  • The tool can see single cells and tiny parts.
  • It works in animals such as mice and fish.
  • Scientists can record brain activity for many hours.
  • This method helps researchers understand brain function better.

Difficult words

  • researcher — a person who studies science and asks questions
    Researchers
  • activity — something that a living thing does
  • living — being alive now, not dead
  • chemical reaction — a process where chemicals change and make light
  • external — from outside, not from the object itself
  • record — to save information for later use
    recording

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Have you ever looked at cells with a microscope?
  • Do you like learning about the brain?
  • Would you like to work in a science lab?

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