Marc Andreessen: AI is an "80 year overnight success." "Something about AI causes the people in the field to become both excessively utopian and excessively apocalyptic." "What's actually happened is—in retrospect, an enormous amount of technical progress built up over time." "For example, we now know that the neural network is the correct architecture. There was a 60 or 70 year run where that was controversial." "Everything we're building on today sort of derives from the original idea in…