f we asked you to name the towering achievements of 20th century science, you might point to relativity, genetics, the polio vaccine, and space travel. And of course you’d be right.
But science also made a different kind of breakthrough in the last century: it began to map out, in a precise way, what we could not know.
Think about that. The sophistication of our observations, and our thinking, had grown to the point that they could expose the limits of knowledge itself. We began to glimpse the