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Science, technology, engineering, and math (STEM) jobs are a key contributor to economic growth and national competitiveness. Yet STEM workers are perceived to be in short supply. This paper shows that the ‘STEM shortage’ phenomenon is explained by technological change, which introduces new job skills and makes old ones obsolete. We find that the initially high economic return to applied STEM degrees declines by more than 50 per cent in the first decade of working life. This coincides with a rapid exit of college graduates from STEM occupations. Using detailed job vacancy data, we show that STEM jobs change especially quickly over time, leading to flatter age-earnings profiles as the skills of older cohorts became obsolete. Our findings highlight the importance of technology-specific skills in explaining life-cycle returns to education, and show that STEM jobs are the leading edge of technology diffusion in the labor market.