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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. Learners...

This is an online simulation of how sound changes due to environment. How does place--like a cave, a pier, or a forest--affect certain sounds? Move the sound pieces around and change the location...

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...

This is a virtual representation of a sound mixer containing pre-looped sounds of animal, insect, and environmental noises. Learners can manipulate the sounds by adjusting the knobs and tuning the...

In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light. They can also...

In this simulation, learners model two elephant seal populations and how they change over time. Learners start with cards representing a variety of seals. Each generation, some seals survive to...

In this online activity about heart disease, learners will, with the virtual help of an actual surgeon, watch a virtual bypass surgery. There isn't a lot for the learner to do, but it is...

In this seismic simulation, learners play a "who-dunnit" game to explore earthquakes. Learners act as the source, carriers, and detectors of earthquake waves, while the group determines...