We save all our knowledge in text. Wikipedia and even the whole internet is full of it. But text is only an abstract method of saving knowledge that is far from how it is saved in our heads... And text is currently also the only way of searching. It costs too much energy to convert our thoughts/fantasy to text...

Real knowledge is in the associations and connections! But how should we save it then? How should we present knowledge? How should we search it? There could be more intuitive ways!