I think that at least 200 years but I am not sure.
answ2. Old books, >250 years show no signs of degradation.
Books (paper) made with the chloride process probably less that 70 years.
Modern papers - depends on the quality of the paper.
No. The powder is scales that cover the membrane of their wings. The powder itself is not used to fly, but it helps to protect the membrane underneath. Touching a moth or butterfly's wings will not prevent it from flying, as long as you are gentle.
This depends totally on the volume of water, the materials the water is touching, and the temperature of those materials.
This depends of many factors: temperature, stirring, geometry of container, volume of water, mass of milk, agglomeration of milk powder.
The process by which a iron piece touching a permanent magnet behaves as a magnet as long as it maintains contact is called magnetic induction. not only does this work when the iron is physically touching the magnet but it works as long as the piece of iron remains under the influence of the magnet. A iron piece attracted to a magnet through a paper with out any physical contact will also behave as a magnet.
This depends on the temperature, stirring, ratio milk/water, time of adding water to powder, volume of the water aliquotes, etc.
This depends on the nature of tablet, temperature of water, stirring, crushing of the tablet to a fine powder, etc.
How long does harry hornes custard powder last when can is opened
This depends on the temperature, stirring, ratio milk/water, time of adding water to powder, volume of the water aliquotes, etc.
I think if you keep your hand long enough in a freezer it can get frost bite, but no. You can not get freezer burn from touching a freezer. That requires a long peorid of time.
paper towel roll?
As long as the ball is touching the line, it is considered in. Even if the majority of the tennis ball is out, as long as a tiny sliver of that tennis ball is touching the line, it is considered in.
3 months.