After receiving an email stating this, I looked it up on Snopes, and it's not true. Also, it's not good to drink cold water with meals, but hot water helps dissolve fats in food. Cold water does the opposite.
Acetone doesn't attack glass.
yes
To avoid the glass from breaking.
Fire polishing the ends of tubes and rods made of glass seal small cracks, which help reduce the chance of fractures. This is especially important due to the sorts of harmful chemicals often placed within a glass tube.
Because glass is mostly inert, that is most chemicals don't attack it.
They may not know there is glass and it takes time for them to learn. If your tank glass is reflective they may think it's an enemy fish and try to attack. If that's the case, I suggest getting a clear glass tank before the fish hurts itself too much.
Place the hot glass in a slight draught will help it to cool slowly and avoid cracking.
Pyrex (the traditional borosilicate glass Pyrex made by Corning before 1998) is safe for both applications. Avoid the more recent Pyrex made by World Kitchen. The January 2011 issue of Consumer Reports indicates that it is not safe.
GIC has silicate 'GLASS' in it's powder and so while mixing on glass slab the polyacrylic acid attack the glass content of glass slab. This may even alter properties of GIC.
To avoid dangerous tension in the glass.
To avoid accidents and damages.
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