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Why can the same bitter chemical taste stronger to one person?

The same bitter test compound can produce different sensations in different people. Research on the TAS2R38 receptor connects genetic variants with responses to PTC and PROP. Detecting bitterness is still different from liking a food, whose taste involves more than one compound or receptor.

3–7 min

Questions you could explore

  • Why would sensitivity to one laboratory test compound be an incomplete prediction of someone’s food preferences?
  • How can variation in a taste receptor affect sensitivity without determining an entire person's diet?

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3–5 min

Daylight and the body's clock

Health and the body3–5 minEven in a room with no clocks, your body follows an internal roughly 24-hour schedule of sleepiness, hunger, and alertness. Those internal daily rhythms respond to outside cues, with morning and evening light helping reset and coordinate the body's master clock.

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4–5 min

How vaccines build immune memory

Health and the body4–5 minThe first time the immune system encounters an unfamiliar antigen, building a response takes time. Vaccines help develop recognition and memory before a later encounter with a pathogen. Different types introduce antigens or instructions for making them in different ways, offering a starting point for exploring how immune memory works.

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2–3 min

Antibiotics and the viruses they cannot treat

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