The major parties up upping the ante on the campaign trail today, with Scott Morrison claiming Labor's climate policy would cost businesses $25 billion to cover international carbon credits.

After months of huge, yellow "Make Australia Great" billboards, ads and unsolicited robocalls, Clive Palmer has officially announced his foray back into politics.

Australia's alt-right movement is fighting a cultural battle to push the political narrative to greater extremes through infiltration and social media campaigns, says expert Jordan McSweeney - and they're having some success.

North Korea is boasting of having test fired a new tactical guided weapon, less than two months after the failed nuclear talks in Hanoi.

Scientists in the United States have managed to restore the function of some brain cells in pigs that had been decapitated hours earlier, according to a report in the journal Nature.

French President Emmanuel Macron has set an ambitious goal of rebuilding Paris's Notre Dame cathedral in five years; A steady decline in calls from boys to the Kids Helpline is attributed to cultural influences preventing them from seeking help; And a UNICEF report has shown that climate change, education and mental health are the top concerns for young Australians.

A UNICEF report shows climate change, education and mental health are the main issues concerning children and young people after consultations with young people in city and regional areas across Australia.

French President Emmanuel Macron has set what some think is an optimistic goal of completing the restoration of the gutted Notre Dame cathedral in five years; we asked to medieval architecture expert John James if that was possible — and where it should start.

Labor's franking credit reforms have angered some retirees in the Sturt electorate in Adelaide's east, who say they'll be thousands of dollars out of pocket

— and if not for the policy, may have considered voting Labor.

The latest data from the Kids Helpline shows a steady decline in calls from boys over the last decade; experts say cultural stigma is what's preventing boys from seeking help.