yeah, I deal in generalisations mainly @tonys  its a mathematical way of definining a problem.

whats number 1 step in calculating a problem ok its estimation, what ballpark would a reasonable answer be . then define problem , answer it, compare to estimation ...then if need be , re check your working ..

I think the names on front page mean who was on here last/and or which thread was active last. Dont find myself there often these days. Will have a look. doubt there are many people on at anyone time esp at night