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In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing).

In this activity, learners create and reveal secret messages written with invisible ink! The invisible ink is actually a baking soda solution, and the magical revealing liquid is fruit juice.

In this water pollution activity, learners create pond water cultures and investigate the effects of adding chemicals or natural nutrients.