I'm a retired nuclear scientist/engineer with experience in several technical fields extending back to slide-rule days in the late 1960s. I have worked in several capacities in nuclear energy, including as a power reactor Control Room Operator. A search in Wikipedia for "user:Rb88guy" will show a page I wrote some years ago that is still mostly correct. I have published a number of peer-reviewed technical papers, both nuclear-related and on IAQ (indoor air quality). I have been a math/physics high-school substitute teacher, and tutor, and I also taught AP Physics C for a full school year (07-08). My email is nikenuke@ieee.org (I am a Life Member of IEEE). I contributed to Geogebra about 10 years ago under user name "nikenuke". This name refers to my service in the US Army, both at a Nike missile site and in the Army Corps of Engineers Nuclear Power Program. I have a Master's in Applied Nuclear Science (Georgia Tech, 1976); it's a long story as to how this happened, but I took a lot of applied statistics courses at Tech, for that Master's. Since then, in several jobs, I have done quite a lot of applied-stat work. I wrote the original version of the Wikipedia article "Experimental Uncertainty Analysis," among a few others.