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Dig a hole, line it, fill it with fresh water, and you have a water hole: a good place to study colonization.

In this activity, learners work in teams to study the observation skills essential to scientific research.

In this activity (on page 2), pairs of learners create an imaginary crime scene. One person leaves the room while the other person moves a few things around.

In this activity, learners observe live fish in tanks to consider how their body structures are related to their behaviors and habitats.

In this lesson, learners are challenged to discover the relationship among six numbers.

Learners explore the physical properties of a variety of balls and how they bounce.

Learners draw and describe a leaf, and then re-find leaves drawn and described by other learners. Learners can observe leaves outside, or leaves may be brought into the classroom.

Learners measure irregularly shaped bones using a variety of measurement methods and tools. Then, they measure again using standard conventions and metric tape measures.

In this simple game, learners start to understand how to sort and categorize objects by trying to guess the connection between three items that someone else has chosen.

In this activity, Christina Elson, an archaeologist from the American Museum of Natural History, guides learners as they investigate an "artifact" and record their observations in a field journal.