The Internet has humanity’s knowledge. The problem is that there is way too much information. You hear something one day, and when you need to use that information at a later date, you are at a loss. You need to click through a lot of junk and weed through unrelated parts till you find the relevant part.
You need a personalized search engine that searches what you have seen before. A personalized search for topics that you deeply care about. A search engine that retrieves relevant parts and quickly takes you there. A personalized search engine that understands questions asked in natural language.