In his essay Michael Nielsen talks about his way of learning about new field of study. He's using spaced-repetition to remember things he learned. It seems that he adds a lot of information into his system.
Example of two questions he adds to his system, after reading one paper is
"What does Jones 2011 claim is the average age at which physics Nobelists made their prizewinning discovery, over 1980-2011?” (Answer: 48)
“Which paper claimed that physics Nobelists made their prizewinning discovery at average age 48, over the period 1980-2011?” (Answer: Jones 2011)
Are there any disadvantages from trying to remember so much information? I don't mean the obvious ones like time it takes to create cards / test them. I think I read somewhere that there is a tradeoff between memory flexibility and amount of information you can learn but I can't find it now.