Barbara Oakley talks about this in her talk at Google, &quot;Learning How to Learn&quot;.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=vd2dtkMINIw&amp;feature=youtu.be&amp;t=13m32s" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=vd2dtkMINIw&amp;feature=youtu.be...</a><p>She says Edison did the same thing too, but had a handful of ball bearings instead of a key.