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How quick are your reflexes? In this online game, you are a hockey goalie defending quick slap shots. Learn about reaction time, muscle memory, and reflexes.

In this lesson that includes hands-on activities and demonstrations, learners discover that it is the tilt of the Earth's axis (not its proximity to the sun) that causes the seasons.

In this activity, learners will be introduced to citizen science projects that can be done from home.

In this activity, learners will explore how the voice works and feel the vibrations produced by vocal cords.

In this art activity (page seven of the pdf), learners will use their creativity to make a "motion collage." Each student will be encouraged to draw a picture of something that moves to be a part of t

In this physics demonstration, learners will be surprised when a handkerchief holds water in an upside-down glass.

In this sorting activity, learners play a game in which they try to identify the largest number of differences between two objects.

In this outdoor activity (on page 2 of the PDF under GPS: Baseball Activity), learners will investigate the transfer of energy using sports equipment.

In this outdoor activity, learners review the parts of the synapse and their functions by playing a game.

In this online Flash game, learners will captain a sailing challenge, adjusting boat direction and sails, seeking the way to take greatest advantage of varying wind speeds and directions to catch the

In this activity, learners start their own field journal to better understand the wildlife in their area.

In this activity, learners measure and calculate the amount of cubic feet various containers contain. Next, learners investigate cubic feet per second (cps), by carrying jugs in one second.

In this seismic simulation, learners play a "who-dunnit" game to explore earthquakes.

In this optics activity, learners experiment with polarizers (small dark rectangles) to examine light intensity.

In this activity (on page 1 of the PDF under SciGirls Activity: Soccer Ball Kick), learners will investigate the transfer of energy using sports equipment.

This activity is on page 3 (continued on page 2) of the pdf, part of the Simple Machines Discovery Box. In this fun activity, learners "create" a complex machine by simulating the parts in action.

In this activity, learners explore how the area of Arctic sea ice has changed over recent years. First, learners graph the area of Arctic sea ice over time from 1979 to 2007.

In this activity, learners use whale count data from the Hawaiian Islands Humpback Whale National Marine Sanctuary to compare whale counts in relation to environmental factors.

En esta tira cómica, Cientina le enseña a Mateo un truco de lógica nuevo con seis tarjetas.

In this robotics activity, learners find ways to express emotions and feelings using only body movements, not facial expressions.