For at least a decade, one of my favorite websites to visit when I want long-form, deep conversations that span disciplines has been edge.org
The website is the product of John Brockman. While you might not know this name, you’ve almost certainly felt his impact. A publisher of science books for general audiences with a mission of bringing together artists, scientists, and the public, he is responsible for bestsellers like Guns, Germs, and Steel among many others. I’d describe the website in more detail, but I think their header sums it up better than I ever could:
To arrive at the edge of the world’s knowledge, seek out the most complex and sophisticated minds, put them in a room together, and have them ask each other the questions they are asking themselves.