Actually ur title and concept is quite interesting to debate, however where is ur pic source? i mean how can we believe that the pic content is reliable to believe with?

And what do u mean by what is unknown in this world? What type of things is that?
Do u draw it that way bcoz of believing human dont have such advance technology or method to find out the many truth in this world?
If u cant find reliable supporting fact to support the diagram u draw is truth i cant think that the diagram is draw according to fact

According to ur question regarding human learning,
this is rather meaningless to talk about how fast or when can we absorb the total knowledge available,
unless u able to find out how many 'knowledges' are there in total in this world
and then calculate how many percent is our progress
Otherwise, many points u give here does not really explain the progress of human learning