Thanks for the kind comments but credit should be given to the authors of the studies. They did the work I only reported what they found.

It is an eye-opening concept with much to learn.

Here is a previous PB link for more info

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Main=35643&Number=466598#Post466598

Last edited by ewest; 07/07/17 12:07 PM.