The USS Ronald Reagan, one of the world's largest and most powerful military ships, has arrived in Brisbane with tourism bosses expecting thousands of American sailors on board to spend big.

The 333-metre long ship, which is more than 20-storeys' high, docked in Brisbane on Saturday morning ahead of a joint military exercise between the US Navy and the Australian military.

In Queensland about 25,000 military personnel will train near Shoalwater Bay between July 11 and July 24.

A south-east Queensland maternity support program for Indigenous families has almost halved the odds of pre-term births, a result hailed by researchers as "quite extraordinary."

The Birthing in Our Community program aims to close the gap in maternal and infant health outcomes, and Brisbane mother of three Rebekah Hauiti says using the program ensured the health of her children.

 Adelaide doctors have received access to a non-invasive and cutting-edge form of radiation therapy which treats brain tumours.

Cancer treatment specialist Andrew Potter, says the new system uses an imaging system which destroys cancer cells with minimal damage to healthy cells.

Dr Potter said the type of brain tumour treated by the new system is estimated to occur in up to 40 per cent of cancer patients.

Former rangers, traditional owners and conservationists warn Australia's national parks are reaching an environmental tipping point, with funding cuts at both a state and federal level leaving them in poor condition.

$121 million was cut from NSW national parks in the 2016-17 budget, slashing about 100 ranger jobs and in the latest NSW budget, $80 million has been cut from the department overseeing parks.

Sudanese ruling generals and protest leaders have agreed to establish a joint sovereign government in a landmark decision which could end months of political turmoil.

African Union mediator Mohamed Lebatt said the new council was last for at least three years and consisted of rotating representatives for the military and civilians.

The agreement comes after two days of negotiations between Ethiopian and African Union mediators.

Greece’s centre-right opposition party New Democracy has won the country’s general election with a projected outright majority.

The prime minister-elect said he has a strong mandate for change and seeks to be a president for all Greeks.

The election turnout was the lowest in two decades at 57 per cent, despite all citizens being technically required to vote.

Protesters in opposition to Adani say Brisbane peak hour march was only a minor inconvenience compared to if the mine goes ahead. 

Rally organiser Catherine Robertson says the protest was angry, loud and occupied major intersections for quite some time with some activists wearing hazmat suits to display the "crime scene" which would unfold in the Galilee Basin and Great Barrier Reef if the mine was not stopped.

The protest was organised by the same groups behind a similar protest on June 21 which occupied the Victoria Bridge.