
This tweet seems to have gotten some spirited pushback, so I think it's important to clarify what I think Kauffman is saying here: starting from string theory or quarks, you could potentially derive human hearts as one of multiple events/artifacts in the universe of possibilities. But the *causal* relationship between the structure of the heart (its ability to pump blood) and its fundamental role in keeping organisms alive and therefore making the biosphere possible is an evolutionary accident. Physics *by itself* cannot capture this contingency. Perhaps we need to indicate the difference by saying "reduced to" vs "explained by".


