While it was great to see women top the bill at Apple's developer conference this week, I do hope the focus on diversity isn't just optics. The company's own diversity report revealed that 70pc of its employees were male and 55pc were white - Twitter and Facebook have a broadly similarly make up. Apple Pay vice-president Jennifer Bailey (inset) was first on stage, the first time a woman executive has presented at the event since 1976. What is it about tech that makes it one of the most gender-biased industries? It seems women aren't as interested if they're not being raised in an environment that encourages them to study science and maths.