This is an idea so simple that just stumps me in awe. For entire life I was looking pencils being thrown as they are short to write with. Simple amazing.
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.
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.
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.