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In this activity, learners sublimate dry ice and then taste the carbon dioxide gas.

Some bugs can walk on the surface of a lake, stream, river, pond or ocean.

In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors.

Extract your DNA from your very own cells! First, learners swish salt water in their mouth to collect cheek cells and spit the water into a glass.

In this quick and easy activity and/or demonstration, learners use two empty 2-liter bottles and hot tap water to illustrate the effect of heat on pressure.

In this activity (12th activity on the page), learners conduct an experiment to demonstrate how muscles are constantly feeding information to the brain about what they are doing.

In this activity, learners interact with a 3-D model of a watershed to better understand the interconnectedness of terrestrial and aquatic environments.

In this activity, learners explore how air warms when it condenses water vapor or makes clouds.

In this activity, learners use a laser pointer, empty soda bottle, rubber plug and water to demonstrate total internal reflection.

In this activity, learners explore clouds and how they form.