My name is Kevin and I am interested in science, mathematics and logic. Last night I helped a member of another forum by correcting the citation of a post from this forum. I do not have sufficient privileges to comment in that thread or it is locked. I thought you should know that as a messenger and scribe I was criticized for fostering the spread of incorrect information by engineers on that site. http://speedtalk.com/forum/viewtopic.php?f=1&t=44265&start=30#p568140 in reference to this: https://www.physicsforums.com/threads/pushing-the-piston.357037/#post-2461678 So, in the immortal words of another forum member, caveat lector. Carry on.