We are going in circles as often. That cannot be helped as there will always be a passing stream of active members in web communities. Members come and go. That's why it can be helpful to refer to on older thread on the same subject. Some of us may remember that a (then) newcomer raised the same questions nine months ago. Regrettably, that thread took an unfortunate turn and ended by major force. Maybe you find more answers (scentimental and others) here. What the junior professor (tgl) said belongs to the most memorable posts I read on BN.