QnA: Fridges and impossible food

In this month's QnA show we're asking: why are fridges harder to open again after you just closed them? What's the best way to wipe the memory of a smart phone? And what might climate change mean for chocolate? We're answering your questions with the help of an expert panel - neuroscientist Duncan Astle, techxpert Peter Cowley, food security expert Nadia Radzman and engineer Livia Souza...