I've made a conscious effort recently to make more mistakes (my apologies to the people on julia-users). I feel it's improved the rate at which I learn things. And I feel validated by "Antifragile" which I've just started reading.
(By chance I am also currently being tested for brain damage. It's bitterly amusing that I end up being unsure if I am actually making more mistakes on purpose or not...)
[edit: i know what bash.org is. but that appears to be a conversation between multiple people all with the same nick.]