As firefighters battle a fire at a Melbourne warehouse, fuelled by lithium-ion batteries, we speak with a forensic fire investigator about what made it a particularly difficult fire to fight. There has also been a fire at in the wetlands of Altona, we also ask how it is a wetland burns. Plus, as the world's most dangerous airlines are named — we get the inside word from a former airline captain on how legitimate the ratings are and what impact they may have on consumer behaviour. And we also talk why shoppers are finding some forms of fruit just too hard