[Margaret Pilkington]

oh dash......'sussed' again.
Yes you are right......and I know there will be no qualms for you as you work in the field of electronics and understand it far better than many of us.....however, as time goes by we learn things about humans and how things affect us......we still know pretty little about how the human brain works(!).......and what i was trying to put over(and seemingly failing) was that some things which cause no harm to some humans, may have the potentiall to affect others......in spite of what 'experts' tell us.

We have to let others make a choice about what they believe...and in essence you are agreeing with that.......but a healthy dose of scepticism does no harm.
Whatever others say, I think that most of us make our own minds up about things.