Is weapons training injuring soldiers' brains?

Soldiers who've never been to war are showing signs of PTSD. Could firing their own weapons in training be injuring their brains? Gaza ceasefire negotiations are continuing, with the US warning this could be the last opportunity to broker a truce and hostage release. And with so much talk of defamation action lately, we're asking is it too easy for politicians to take someone to court for attacking their reputation? Plus, we unpack the secrets around "dark marketing" and why you're seeing more of it. Guests: Elise Worthington, national health reporter, ABC Brendan Clift, law lecturer, University of Melbourne Nick Carah, marketing expert, University of Queensland