> most – say, 90%, of what I learn at one job is completely useless for the next one This is the most surprising claim, to me. I would have flipped the ratios

> most – say, 90%, of what I learn at one job is completely useless for the next one This is the most surprising claim, to me. I would have flipped the ratios. Even the most radically different jobs I've had shared more than 10%. 90% of the facts that my boss tells me are useless for the next job, true, but 90% of what I learn are not the facts which are told to me.