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In this group activity, learners will mark important developments of life on Earth on a timeline (each foot in length representing 200 million years).

Learners add acid rain (nitric acid) to two cups that represent lakes. One cup contains limestone gravel and the other contains granite gravel.

This fun and simple hands-on astronomy activity illustrates the value of supernovae in the universe.

In this online activity, learners discover how random variation influences biological evolution.