Women are massively under-represented in physics and other STEM (science, technology, engineering and mathematics) subjects, at all levels, firstly I will explain why this matters, then I will discuss what we can do about it. What's the problem? In the UK, female students made up about 20% of all those studying A-level physics (a qualification which is needed for most university level physics courses.) More worryingly, almost half of schools have no female students who continue to study…