I agree with Popper in many ways. Most of the so called "truths" are just accepted because we've known it to be that way, until new truth comes up or until a new hypothesis is created to prove otherwise. Others are indisputable of course, as correctly said. But it is very interesting that life and living is made up of certain elements of belief systems and this is what drives humanity. Over time people become smarter, make new discoveries and challenge the status quo. Then the new hypothesis is born and proven again. Life is really evolving, and interesting.