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This activity is designed to let learners measure their reaction time or response time to something they see.

This is a quick and simple demonstration about reflexes (fourth activity on the page). One learner stands behind a see-through barrier like a window or wire screen.

This is a quick and simple demonstration about reflexes (second activity on the page).

In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses.