Make those microbes warm up water. Pupils first investigate water pumps, then design a water circulation system that uses solar energy. A bioreactor in the system takes energy from compost and helps heat water.

If changing one variable can improve a design, why not try changing more? Using the results from the previous activity, scholars decide on the variables that caused the most improvement in the effectiveness of the solar heater. They take...

Always strive to make things better. The second of three activities in the Experimenting with Solar Heaters unit has learners design new solar heaters that are more effective compared to the simple models they used in the previous lesson...

Heat up a lesson on solar energy. The first of three parts in the Experimenting with Solar Heaters unit has scholars construct solar heaters. They then use them to heat up a container of water and calculate the amount of heat energy...