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A NATO helicopter crashed in southern Afghanistan on Thursday, killing two Australian troops, officials said, bringing that country's military fatalities to five in less than 24 hours.

Harvard University is investigating allegations that about 125 undergraduate students cheated on a spring takehome final exam, school officials said on Thursday, disclosing what would be the largest cheating scandal in its recent history.

Twin satellites rocketed into orbit Thursday on a quest to explore Earth's treacherous radiation belts and protect the planet from solar outbursts. NASA launched the science probes before dawn, sending them skyward aboard an unmanned rocket.

Three more NATO soldiers were killed Wednesday in what is fast becoming an epidemic of Afghan soldiers - sometimes insurgents in disguise - murdering their western mentors. So far, 45 NATO troops have died this year in "green-on-blue" shootings.

Paul Ryan wowed the Republican National Convention on Wednesday with a passionate, occasionally snide and often funny speech to delegates after accepting the party's nomination as Mitt Romney's running mate.

Dozens rescued in southern Louisiana

Sounding more Hollywood caper than Animal Planet, the saga of Hercules the kidnapped squirrel monkey included a risky heist, an anonymous phone call and a secret exchange on a New Brunswick country road on Wednesday.

A man who wants to spoil the Parti Qu脙漏b脙漏cois' sprint to electoral victory found himself fending off some sharp elbows tossed his way Wednesday.

Pair can now talk by phone or via Net

New Orleans tests new defences on seventh anniversary of Katrina