Japan warns of iPod nano fire risk

Japan on Tuesday warned users of Apple iPod nanos of a potential fire risk, after two new instances in which the popular portable music players overheated.

The economy, trade and industry ministry has received two new reports of minor fires in August in Tokyo caused by overheating iPod nanos, said ministry official Hiroyuki Yoshitsune. There were no injuries and the cause is still unclear, he said.

Japan had already launched an investigation in March after another Apple iPod nano sent out sparks. According to the ministry, Apple Computer has been notified of a total of 14 similar cases in Japan. Out of those, two users suffered minor burning.

The ministry said the incidents were caused by four models - MA004J/A, MA005J/A, MA099J/A and MA107J/A - of which 1.81 million units were sold between September 2005 and September 2006 in Japan.

"Users need to be careful about overheating of the machines," the ministry said in a statement, warning that particular care is needed when recharging the iPods.

"Our ministry told Apple to improve its technological development and probe the cause of the incidents so that similar incidents do not happen again," the official said.

There was no immediate comment from Apple. Public broadcaster NHK said the company has no plan to recall any iPods but is ready to exchange defective parts.

The US computer giant has already warned that iPod, iPod nano or iPod shuffle may generate excess heat while being charged in certain carry cases.

Lithium ion batteries, which Apple uses for iPods, are common in consumer electronics, such as mobile telephones and personal computers.

However, major battery makers, including electronics giant Sony Corp., have occasionally been forced to recall their lithium ion battery packs after reports of overheating and fire.

Lost world 'found' in Antarctica

Scientists have discovered a lost world in Antarctica, which they claim is preserved exactly the same way when it was frozen some 14 million years ago.

An international team has found fossils of plants and animals in the mountains on the interior of Antarctica, which it believes became extinct due to an abrupt climate cooling of 8 degree Celsius in 200,000 years.

In their study, the scientists have combined evidence from glaciers from the preserved ecology, volcanic ashes and modeling to reveal the full extent of the big freeze in part of the southernmost continent called the Dry Valleys.

According to them, the lost world is an extremely rare find in the continent, one that also provides an insight into what could be there in a century or two as the planet warms, The Daily Telegraph reported.

Lead researcher Professor Adam Lewis of North Dakota State University said, "The discovery of lake deposits with perfectly preserved fossils of mosses, diatoms and minute crustacea called ostracods is particularly exciting. They are the first to be found even though scientific expeditions have been visiting the Dry Valleys since they were discovered during the first Scott expedition in 1902-1903."

"The fossil finds allow us to examine Antarctica as it existed just prior to climate cooling at 13.9 million years ago. It is a unique window into the past. To study deposits is akin to strolling across the Dry Valleys 14.1 million years ago," said co-researcher David Marchant of Boston University.

However, what caused the big freeze is yet unknown though theories abound and include phenomena as different as the levels of carbon dioxide in the atmosphere and tectonic shifts that affected ocean circulation.

"If we can understand how we got into this relatively cold climate phase, then that can help predict how global warming might push us back out of this phase.

"For the vast majority of Earth history there was no permanent ice like is common today at poles and even the tropics at high elevation," Prof Lewis was quoted by the British newspaper as saying.

The findings have been published in the Proceedings of the National Academy of Sciences journal.