Until it is needed ..
Probably for many people it is clear that there are no things and devices that everyone would need, as well as there are no practically such inventions that no one would need at all. The whole question is in what circumstances a person lives, that is, that one needs every day, the other may not be needed for a number of years! And if so, then he may not know about any things. For example, how many people know what it is — ISOVER House insulation? In the way, as one comedian said …
