The document discusses brain drain, which is the emigration of skilled individuals from developing countries to developed countries. It provides historical context and discusses push factors like lack of opportunities in home countries and pull factors like better pay and facilities abroad. While brain drain has negatively impacted developing nations, some argue it can become "brain gain" if skilled emigrants return with new knowledge or if their success inspires others to remain. Larger countries experience less severe brain drain relative to their populations. Addressing factors that drive emigration like improving education and opportunities could help stem continuous losses of human capital.