I remember watching a show in which Indian scientist Yash Pal had proclaimed that number to be zero. Argued that more a civilization progresses, more the chance

I remember watching a show in which Indian scientist Yash Pal had proclaimed that number to be zero. Argued that more a civilization progresses, more the chance of it being devastated by forces of nature, etc., thus its highly improbably that civilizations exist on other planets (or rather, we on earth are a very odd case scenario).