Automobile Engineering · Powertrain
Model a four-stroke engine
Build a card-and-syringe model that shows intake, compression, power and exhaust.
- Easy
- 2–7 days
- 250–500
60 projects
Chemistry + Environmental Science
Test how well different materials filter dirty water
Build layered filters from sand, gravel and charcoal and compare how clear the water comes out.
- Easy
- 1 day
- Under 250
Crops, Soil and Horticulture · Horticulture
Grow vegetables on a balcony or roof
Plan, plant and harvest a small container garden and record costs and yield.
- Easy
- 1–3 months
- 500–1,000
Crops, Soil and Horticulture + Biology
Study hydroponics against soil growing
Grow leafy plants in a simple water-based system and in soil and compare growth and water use.
- Intermediate
- 2–4 weeks
- 500–1,000
Electrical Engineering + Environmental Science
Generate electricity from a bicycle
Couple a DC motor to a bicycle wheel and measure the power a person can produce.
- Intermediate
- 1–2 weeks
- 1,000–2,500
Chemistry · Electrochemistry
Electrolyse water and collect the gases
Split water with a 9 V battery and show that hydrogen and oxygen form in a 2:1 ratio.
- Intermediate
- 1 day
- Under 250
Physics · Electronics
Build a crystal radio receiver
Receive AM radio with no battery using a coil, a diode and a long wire aerial.
- Advanced
- 1–2 weeks
- 250–500
Electrical Engineering · Generators
Make a hand-crank emergency torch
Build a torch that stores hand-cranked energy in a capacitor and lights an LED.
- Intermediate
- 1–2 weeks
- 500–1,000
Health Technology + Physics
Explain how an X-ray or ultrasound image is formed
Build a simple demonstration of shadow imaging and echo ranging to explain two medical scans.
- Intermediate
- 2–7 days
- Under 250
Earth Science · Meteorology
Build a rain gauge and keep a weather log
Make a rain gauge and thermometer station and record the weather daily for a month.
- Beginner
- 2–4 weeks
- Under 250
Biomedical Engineering · Biomechanics
Build a prosthetic hand model
Make a string-tendon hand from card and straws that grips objects.
- Intermediate
- 1–2 weeks
- 250–500
Earth Science · Hydrology
Make a model of the water cycle in a bag
Seal water in a clear bag on a sunny window and watch evaporation, condensation and "rain".
- Beginner
- 1 day
- Under 250
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