Throughout history there's been time periods where people from across the world clustered in one area to work with like-minded individuals and to make large bursts of progress in the arts and sciences. These brief time periods are called revolutions. There have been a few revolutions throughout history: The Renaissance, Scientific Revolution, Industrial Revolution, Internet Revolution. Each of these revolutions changed the world in a way that was unimaginable to its citizens, and resulted in exponentially greater abundance for everyone.
We are in the middle of the largest, most significant Revolution of human history, and it's taking place in a small 7 by 7 mile grid called SF. It's something we can easily take for granted, but I think it's important to really be mindful of this by working on the most ambitious problems you can, because any single individual now has the potential to shape the future of technology, and therefore humanity