Questions about causality are raised though, right? Page 4:

Mechanistically, the observed linkages between T. gondii infection and entrepreneurship among students, professionals, and nations have several potential interpretations. Given the correlational nature of the study, observed patterns may not be causal; for example, higher risk-takers could be more likely to be both entrepreneurial and exposed to T. gondii (e.g. by consuming raw/undercooked meat), thereby driving the correlation. Although causality cannot be inferred, the […]