How fast does the eye send messages to the brain and the brain send messages to your hand muscles to react in time to catch a falling object? ScienceU campers find out using the "ruler test".

This is called complex reaction time. Are there any other tests that people can do? Yes. There is a simple test you can do with a ruler. The task is to get someone to hold a ruler above your hand and ...

But how can you assess your reaction time in the comfort of your home? One easy assessment is a well-known experiment known as the "ruler drop test".

Your reaction times can reveal a surprising amount about what's going on inside your body, from your brain health to your risk of an early death.

Humans Holiday brain-off round 2: Test your reaction time Who in your family has the sharpest reflexes? To find out, all you need is a ruler and this table of numbers By Caroline Williams 14 ...