See if you can refit their jaws. Identify the mystery smells. Eye iris Watch your iris change as a light becomes brighter. Listen to sound and test your hearing range. Balance test See how long you can balance.
Strange colours appear after staring hard at a picture.
Secret message See if you can read the message. Mirror drawing Try copying a shape by looking at the original picture in a mirror. Delay phone Record your voice and listen to the effect of delaying its playback. Hot and cold Touch different materials and find out why some feel colder.