Only 4% of Fortune 500 CEOs women. What’s going wrong?

In 1918 Irish women got the right to vote. 1973 heralded the abolition of the marriage bar; 1977 saw the introduction of the Employment Equality Act. Girls now consistently outshine boys across the globe in exam results. Having made so much progress, why are women still underrepresented in political circles and the upper echelons of business?