Marc Andreessen on the generational divide in how people receive new technology, and why it's "prime time" for 18-year-olds to grab AI and run with it: "Douglas Adams, the guy who wrote Hitchhiker's Guide to the Galaxy, had the defining description of how technology is received on a generational level... Any new technology is received three different ways by three different age cohorts." "If you're below the age of 15, it's just the natural way the world works. I've told in other settings the…