Repeat with different tubes. Feely boxes Put your hand into the hidden boxes. Reaction tester Press the green button to start the test. After a random delay the light will come on or the buzzer will sound press the red button as quickly as you can, and the exhibit will tell you your reaction time. Colour blindness Look for the hidden numbers on these cards, used by doctors to test people's colour vision.
Many people get seven or eight right - that's normal vision.
Delay phone Put your head between the two small speakers and try saying a few words into the microphone. Hot and cold Put your hand on each of the surfaces. See how warm or cold each one feels. Check the thermometers to find their actual temperatures. Memory test Press a button to start the test.