Here, you will find much lively discussion on mathematical themes, some of it quite enlightening. I find it a constant source of inspiration.
There is no moderator here. So, anyone, regardless of their mathematical background, can post their opinions and pet theories here -- some far outside the mainstream of accepted mathematical thought to say the least. This not necessarily a bad thing, but we do seem to have more than our share of prolific cranks and trolls. They can usually be distinguished by their outrageous, unsubstantiated claims and by their abusive language. One particularly abusive individual with no discernible background in mathematics, for example, hopes to bring us all back to The Wisdom of the Ancients -- back to Aristotle and Euclid. Another attempts to brand Einstein an evil nincompoop. Really.
Avoid these cranks and trolls if you are looking for answers.