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.
Above that temperature, the sterling silver starts to melt. The phase diagram shows us that the composition of the material that first melts contains 28.1% copper (and 71.9% silver), while that portion of the lump which hasn't melted is essentially pure silver.