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.
There are many alloys that melt at low temperatures. These are called fusible alloys. You may have heard of a famous one, called Wood's Metal. Wood's metal is a mixture of 50% bismuth, 25% lead, 12.5% tin, and 12.5% cadmium.