Carbon dioxide is a very important gas; it is present in the air, used in cooking, and supports plant and animal life. Scholars investigate the properties of carbon dioxide with three different activities. They experience a color change,...

Starry-eyed astronomers draw different views of the Moon in order to introduce its phases. Then they experiment with a ball and a lamp to recreate the phases. A demonstration ensures every pupil understands the process, and the...

Pupils often wonder how we know the distance to various stars. Starting with a thought experiment and progressing to a physical experiment, they determine the brightness and distance to various stars. The evaluation requires...