Explosions in the centre of Kyiv, after Russia's President accused Ukraine of a terrorist attack on a key bridge linking Russia and Crimea.  The weather bureau's latest outlook is bad news for northern and eastern Australia, with more flooding predicted, along with cyclones.  Australia's GPs want faster access to doctors trained overseas, saying bureaucracy is creating needless delays.  And a new study confirms that fluoride is safe for children - but will it make a difference to those fiercely opposed to adding it to tap water?