In this paper we show that the richest countries are investing proportionally less than middle income countries in engineering and technical human capital. We generalize this result, controlling for country-specific effects, cross-time error correlations, heteroskedasticity, the presence of outliers and the introduction of other explanatory variables. Thus, we establish an unexpected stylized fact (about human capital composition): the proportion of high-tech human capital in tertiary education presents an inverted U-shaped relationship with GDP per capita. This is interesting because Research and Development (R&D) endogenous growth models predict and most evidence show that investment in R&D increases with economic development.