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Run it in class

Why doesn't a whole town get sick at once?

Show of hands — before you project anything

Predict before we run it: if half the people are immune, will the germ reach the whole class or fizzle out?

  • A Way more than you'd guess
  • B About what you'd guess
  • C Way less than you'd guess

Count the votes out loud. Hold them to it — then watch.

Project it (fullscreen)

Discussion prompts

  • Predict before we run it: if half the people are immune, will the germ reach the whole class or fizzle out?
  • Predict: if all the immune people clump in one corner, is the town still safe everywhere?
  • Predict: which needs more people immune to stop it — a super-catchy germ like measles or a mild one, and why?

Where it shows up in real life

  • A cold going around school that stops after a few kids because others had their flu shot
  • Getting a measles or chickenpox vaccine at the doctor
  • A firebreak cut through a forest so a wildfire runs out of trees to jump to

A prediction-first worksheet — no answer key.

zero prep · no login · any projector

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