What Do We Know About Economic Growth, Redux is an unpublished short paper. It revisits the cross-country growth literature six years after What Do We Know About Economic Growth Or, Why Don't we Know Very Much? Since then, even more evidence has piled up that growth is a complex, context-dependent process difficult to explain using linear growth models. We do know that the best way to be rich today is to have been rich yesterday, however. That result has led some researchers to revisit Nineteenth Century explanations including God and superior breeding as the ultimate determinants of wealth. But the 'truly ultimate' answer may as well turn out to be geography.