I have helped scientists for 20 years. I dont bleive you can say you fully understand a problem unless your ideas can be tested against the evidence. . mathermatics described in one simple equation the motion of the planets that had alluded men for ages. . When asked what was the most important scientific invention for most people. . though people like me said air conditioning? the consensus was ,„ eyeglasses. letting people read past the age of 40. On Thu, Aug 24, 2017 at 1:22 AM, Masha Drokova Jeffrey, wrote: