The US First Lady Michelle Obama makes an impassioned plea for the Nigerian schoolgirls to be returned home. Plus our weekly round up of the latest music, book, web and technology news. We profile the life and times of Dr Dre - the man who could become hip hop's first billionaire. Author Tina Seskis explains how she was rejected by publishers, put out her own e-book, and became a bestseller. Plus the new kit that could revolutionise reading for blind people, and why a Bristol designer says the shape of modern toilets could be causing us unnecessary stress.