Updated US national security strategy and Governor-General Sam Mostyn on her role in polarised times

An updated US National Security Strategy pledges “lethal force” against drug cartels as the US continues a massive military presence off Venezuela - Phil Gunson from the International Crisis Group analyses the situation from Caracas; a candid conversation with Governor-General Sam Mostyn about her role and the "goodness" in Australia that can be masked by media and polarising voices; a guide to the under 16 social media ban with Professor Susan Sawyer, an expert in adolescent health and medicine, and Bryce Corbett, the creator of a media literacy program for primary school kids; Sean Turnell on Myanmar's mass release of prisoners ahead of the military junta's so called elections later this month; and 18-year Tommy Lamb's global overland odyssey to reach Australia for the Ashes.