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.
Gallium is not the only metal that melts into a liquid near room temperature or body temperature. Francium, cesium, and rubidium also would melt in the palm of your hand. However, you seriously don't want to attempt this demonstration with any of them! Francium and cesium are radioactive.