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This online game tests reaction time. The learner controls a computer-generated frog, and must press a button as soon as a fly appears on the game's radar screen or can be heard from the speaker.

In this online game, learners build complicated machines to complete simple tasks. The game starts with a power source on one side of the screen and the task on the other side.

In this online simulation, learners use antibiotics to cure patients with bacterial infections.

In this online activity, learners see simulations of how processes shape the Earth, and see estimates of how long these processes take.

Learners discover that their breath contains carbon dioxide, one of the pollutants found in car exhaust.

Learners complete two simple experiments to prove the existence of air and air pressure which surround us.