Welcome to smile2340.com

I am a retired Math/Physics/Astronomy/Computer Programming Instructor after teaching from 1975/1976 to 2013/2014 years with helping finish the last seven weeks of an Applied Calculus class to 33 college Juniors/Seniors after spring break of 2015 (and enjoyed every second of it).

If you enjoy Astronomy (stars/planets/space) you should check out the 5 Must See Videos under the Astronomy tab first.   The videos are under 15 minutes apiece and if you know that there are 360 degrees in a full circle the first video will teach you the fundamental motions of the sky in a way you will understand.

The Physics section is mostly the entire two of three semesters of one of the top Physics programs in the world.   I do not get any credit for this program as the two Physics teachers who designed it retired after teaching it to me and I still think of them as two of the top teachers I've ever had the opportunity to work with.

The Pythagorean Triplets sections is hopefully one of the dents outward in the sphere of the knowledge of planet Earth as I think I am the first to name the Primitive Pythagorean Triplets by how they were generated in order from 3, 4, 5 outward.   If you are a teacher maybe you can use the Pythagorean Triplets lists in order of the shortest leg all the way to 120 units in future quizzes/test.

The Rubic's Cube section is just using numbers to remember the seven steps to solving the cube that as a numbers guy I've been able to remember for well over a year now and go months without solving it only to pick it up and have no problem solving the cube again.

Currently working on:

Still working on Genealogy.  The total grandparents of any infant in the history of the world is on the back burner waiting for more insight.  So far I found that in April of 1058 the graphs of the population of the world and total grandparents doubling them every generation meets.   So the problem is that mathematically the doubling grandparents every generation has to BE WRONG. 
I did find that marrying family members has been a common phenomina even today in many countries with many benefits including keeping the wealth in the family and marriages lasting longer because the couple has more in common.  Starting with Seth (3rd son of Adam & Eve as Cain killed Abel and Cain's descendents all perished in the Great Flood) married his sister Azura (in the Book of Jubilees).  If from Adam to son Seth to son Enos to son Kenan to son Mahalalel to son Jared to son Enoch to son Mehuselah to son Lamech to son Noah had all married their sisters then there would be only 20 grandparents before the great flood instead of 2^10 = 1,024 grandparents over the 1,666 years from Adam to the great flood that only Noah & his three sons and the four wives survied to continue the human race after the great flood of 2334 BC.  
So before the great flood a generation was like 167 years as 10 generations lived over the 1,666 years from Adam through Noah but after the flood a life span went from over 900 years to 120 years maximum.  My life expectancy (according to social security) is 84.3 years old and my wife's 86.6 years.  
A generation today according to one study is 25 years but after a lot of scientific study found 29 years to a generation was much more accurate.