\documentclass{article}

   \title{Natural selection in the Health and Retirement Study}
   \author{XXX}
   \date{September 2023}

   \begin{document}

   \maketitle

   \begin{abstract}
   I investigate natural selection on polygenic scores in the contemporary US, using the Health and Retirement Study.
   Results partially support the economic theory of fertility as an explanation for natural selection: among both white and black respondents, scores which correlate negatively (positively) with education are selected for (against).
   Selection coefficients are larger among low-income and unmarried parents, but not among younger parents or those with less education.
   I also estimate effect sizes corrected for noise in the polygenic scores. 
   \end{abstract}

   \end{document}