Auditory processing disorder (also known as central auditory processing disorder or CAPD) is a condition that makes it hard for kids to recognize subtle differences between sounds in words. It affects their ability to process what other people are saying.
Gallium is a solid metal at room temperature, but it melts in your hands. 00:09. When gallium is in its liquid state, if feels like cold melted solder in your hands. 00:33. Melting gallium onto aluminum makes the aluminum brittle enough to break with your fingers.
When you are done examining the gallium, tilt your hand to allow the metal to flow into a non-metal container. If the container is also warm, the slow cooling will allow you to watch gallium form metal crystals. You can supercool gallium, which is holding it as a liquid above its freezing point.