On Friday, September 22, 2017, 1:38:28 PM PDT, juan
   <juan.g71@gmail.com> wrote:
   On Fri, 22 Sep 2017 19:30:42 +0000 (UTC)
   jim bell <[1]jdb10987@yahoo.com> wrote:
   >
   >> Sometimes somebody gets a new idea.
     >  And the new idea is based on (a lot of) old ideas. At best it's
       a new rearrangement of old elements. Especially in technical
       fields where valid ideas have to stick to physical/mathematical
       principles that are *not* invented, but discovered.
   Here's a brain-teaser:   Is mathematics "discovered" or "invented"?
   That's not my question.
   http://www.pbs.org/wgbh/nova/blogs/physics/2015/04/great-math-mystery/
                 Jim Bell

References

   1. mailto:jdb10987@yahoo.com