A fresh start for what was once Europe’s most ambitious electric battery manufacturer. We explore why California-based Lyten has stepped in to acquire the bankrupt Swedish firm Northvolt and whether a startup can truly take on China’s dominance in battery technology.Climate change is threatening the purity of France’s famous mineral waters. The BBC's Hugh Schofield visits the home of Perrier to find out why.Plus, Africa’s first elected female president, Liberia’s Ellen Johnson Sirleaf, argues it’s time for the continent’s vast natural resource wealth to deliver greater benefits at home.