Physics · Waves
Measure the speed of sound with two phones
Use two phones with an acoustic stopwatch app to time a clap over a known distance.
- Easy
- 1–3 hours
- Free
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Physics · Magnetism
Map the magnetic field of bar magnets with a phone
Use the phone's magnetometer to measure how field strength falls with distance from a magnet.
- Easy
- 1–3 hours
- Under 250
Communication · Interpersonal
Study how rumours change as they spread
Pass a short story along a chain of ten people and track what is lost, added and changed.
- Easy
- 1 day
- Free
Astronomy and Space + Photography, Film and Animation
Photograph star trails and find the celestial pole
Take a long exposure of the night sky and measure the Earth's rotation from the arcs.
- Intermediate
- 1 day
- Free
Photography, Film and Animation · Photography
Photograph light: a study of one subject across a day
Photograph the same subject every hour from dawn to dusk and study how light changes it.
- Beginner
- 1 day
- Free
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