Another identity and introduction: NewBie! may be NewPhy. A Closed System assumptions as identity: Born in India (aka hospital) brought up in India ( aka roadside hut) experimented with mud and plastic flying disk as satellite.. Oops! a thread with lenses for telescope! poor enough to satisfy curiosity with availability bias. Heading towards relativity where no two closed systems exist! Simply, aged indian uncle, having interest in atomic and astro physics !