With climate change expected to bring more bouts of extreme weather and longer periods of drought and flooding, this week we take a look at ways to turn the tide on the looming water crisis. Plus, in the news, the schoolboy who's become the youngest person yet to achieve nuclear fusion, the pedicure-inspired tags which are helping track turtles, the new gene therapy breakthrough for treating HIV and, what's worse for you, cigarettes, or sausages?