Hybrid STEM Careers
The BLS's estimate of STEM jobs is probably low, because it doesn't necessarily count the many positions that blend elements of STEM with other disciplines. For example, Isabella Schmitt is the director of regulatory affairs at Proxima Clinical Research, where she helps inventors and scientists meet the federal government's regulatory requirements. The BLS would most likely classify this role as a business occupation, but her degree in chemistry and biology gives her a firm foundation for her work, which involves "creativity, science, technology, writing, argument, team building, teaching, and public speaking."
In addition, many careers blend two or more STEM elements together. For example, all engineering roles require solid understanding of math, and many of them use physics or chemistry in some form — after all, a civil engineer couldn't build a bridge without understanding the loads it can carry and the stresses those loads create on the structure.