Five school girls from Kenya: Stacy Owino, Cynthia Otieno, Purity Achieng, Mascrine Atieno and Ivy Akinyi, will be Africa’s only representatives at Technovation in California next month. It’s a competition where girls aged 10 to 18 develop mobile phone apps to end problems in their communities. The Kenyan team have designed an app for young women at risk of Female Genital Mutilation. BBC Newsday caught up with Purity.