Introduction: Integration of Science, Technology, Engineering and Mathematics (STEM) into learning is an education approach recognized by UN STEM Policy Paper as a priority for a fast-moving technology-driven world. Unfortunately, African countries fall behind STEM education outputs compared to the more developed countries with less than 25% of African higher education students pursuing STEM related career fields. English is central to STEM education as it provides meaningful contexts for learning STEM content. Consequently, Extensive Reading (ER) promotes incidental vocabulary acquisition which is critical in acquisition of language, and STEM educatio