This is fun for all ages (except Sparks, who can hardly catch the ruler). I love to use it with my Rangers when we talk about driving and safety, my Pathfinders just love to compete with one another.

Try this fun reaction time test to see how fast you react. All you need is a ruler and a helper. Can you improve your reaction time with practice?
— Read on www.science-sparks.com/test-your-reaction-time/