I like ideas as such, where someone rediscovers long standing problem everyone forgot or they are not noticing anymore as a problem, and then they make potentially very successful product.
I like ideas as such, where someone rediscovers long standing problem everyone forgot or they are not noticing anymore as a problem, and then they make potentially very successful product.
Stunned me 2 decades ago with click/woodloc parquet.
https://en.wikipedia.org/wiki/Damascus_steel
https://en.wikipedia.org/wiki/Japanese_swordsmithing
And: The PVA adhesive was invented in the early 1950s (Elmer's glue). Since then it has been improved and now we have the yellow glues (Carpenter's Glue, Titebond, etc.) and even now the cross-linking PVAs (Titebond II).
so 7 decades...
While the modern pencil was invented in 1795 by Nicholas-Jacques Conte.
https://en.wikipedia.org/wiki/King_C._Gillette#/media/File:G...
But it is fair point I am not interested to find more what kind of steel do they use for those sharpeners.