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.
Metals with low boiling points, such as aluminium and magnesium, burn in the vapour phase. Metals which have high boiling points, but which melt readily, burn at the surface of a molten oxide + metal mixture, provided the oxide also melts readily but has a high boiling point. Iron and titanium are examples of such metals.