Youngest Sibling
There is (or was, a few years ago) a thing called “the
youngest sibling effect” – or something like that. The idea is that the oldest
is smart: he has to teach the second, and the second has to teach the third, on
down to the last. * They all learn, because you have to put your thoughts in
order to explain things. The last one has no one to teach, so doesn’t learn so
well. The nuclear physicist Richard Feynman touched on then this when he said
that if you couldn’t explain a concept to a fairly bright high school student,
you didn’t understand it yourself. It’s an old concept. Heinlein uses it in The
Moon is a Harsh Mistress. The protagonist hires a teacher whose first
question is, “Well, what are we going to learn this time?”
I Have also had it happen to me. I was with this fairly
bright administrator at work and commented that it was pretty neat that you
could just look at heavy equipment axle assemblies and know how many planetary
gears each one had—large ones, four, smaller ones only three – just by counting
the bosses on the outside of the castings. Then I had to explain why you need
planetary gears on the axles instead of just one really big ring and pinion.
The thing about that is, I didn’t fully understand it myself
until I put it into words.
*This doesn’t apply to my younger brother, who was simply
unteachable.
Steve Coquet
12/02/2017
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