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Description of the Planetary Atmospheres Demo and its Uses page 3

WHAT ARE THE BEST GROUP SIZES?
Best is with 2 to 10 participants at a time.  The demo encourages each person to actively think, contribute and be fully involved. They are the scientists and space engineers, working as a team. At every step, physical components are being touched, manipulated or passed around
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It has been done successfully on a stage, in front of a large audience, with representatives participating.  But, the special learning experience most comes when groups are kept small.

For classes of 30 students, then, the ideal is to have one group of 5 to 10 at a time do the demo with the presenter; while the rest of the class works on other forms of curriculum, or is involved with other hands-on demos.