Water sticks to all kinds of things in nature — flowers, leaves, spider webs - and doesn't stick to others, such as a duck's back. In this activity, learners explore water adhesion (when water sticks to something else) and cohesion (when water sticks to itself), and how these forces combine to move water along a string. As part of the activity learners come to understand what "variable" means in the context of an experiment.


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