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.
The basis for type metal is lead, a relatively cheap metal, that melts at 327 Â°C. It is easy to handle and makes alloys with many other metals. It is, however, very soft and castings with pure lead are not sharp enough for printing. Lead is poisonous and very heavy.