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.
Brazing, simply put, is joining metal to metal by filling the joint with a different, melted metal at temperatures over 840F. The melted metal filling the gap must be able to wet the pieces being joined so that it is drawn into the gap by capillary action. Below 840F, the equivalent process is called soldering.