A fascinating TED talk on how we as humans have and continue to progress at amazing rates. The nodes of our collective brain are becoming more and more efficient.
Another valid point raised is that no one, and that is no one, knows how to build a computer mouse from scratch.
There will come a time when there are not enough people left who know or remember how to write books or program computers. This time is coming in the IT world. Some systems just cannot be updated because no one remembers how to read or write the specific programming language.