One colleague told me that when he was studying science at school, the relentless focus on the known gave him the impression that almost everything had already been discovered. But in fact, science — as the physicist Richard Feynman once wrote — creates an “expanding frontier of ignorance,” where most discoveries lead to more questions. (This frontier — this peering into the unknown — is what I especially like to write about.) Moreover, insofar as science is a body of knowledge, that body is provisional: much of what we thought we knew in the past has turned out to be incomplete, or plain wrong.
— so writes Oliva Judson in her NY Times column, under the headline “License to wonder“