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Your two nostrils need not carry equal amounts of air

Changes in nasal tissue can make one side more open, then shift the balance over time. Researchers have measured this nasal cycle across waking and sleeping, but describing the pattern is different from proving why it evolved.

3–7 min

Questions you could explore

  • What could continuous airflow measurements show that a single breath cannot?
  • How does the nasal cycle differ from both nostrils becoming blocked by an illness?

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Health and the body

Daylight and the body's clock

Internal daily rhythms respond to outside cues, with light helping coordinate the body's sense of time.

3–5 min

Daylight and the body's clock

Health and the body3–5 minInternal daily rhythms respond to outside cues, with light helping coordinate the body's sense of time.

Health and the body

How vaccines build immune memory

Vaccines make use of recognition and memory, though different vaccine types introduce the relevant information in different ways.

4–5 min

How vaccines build immune memory

Health and the body4–5 minVaccines make use of recognition and memory, though different vaccine types introduce the relevant information in different ways.

Antibiotics and the viruses they cannot treat

Health and the body2–3 minAn antibiotic that helps against certain bacteria has no matching target in the viruses that cause a cold.

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