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Greenpeace Ship Defies Russia by Entering Arctic Route

Greenpeace said on Saturday it had defied the Russian authorities by sending its icebreaker through an Arctic shipping route to protest against oil drilling in the fragile ecosystem.

Earlier this week the global environmental group said Russia had refused its ship permission to enter the Northern Sea Route on several occasions citing concerns about the icebreaker's ability to withstand thick ice.

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Baby Panda is Born at U.S. Zoo, but Who's the Daddy?

A giant panda gave birth to a cub at the U.S. National Zoo on Friday, raising hopes for a rare success after a series of false pregnancies and a death.

"WE HAVE A CUB!!" the zoo announced on Twitter, after the birth was shown live on two Internet webcams from the panda's den.

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Scientists Explore Deepest Trough in Caribbean Sea

The man whose research team discovered the wreckage of the Titanic has now turned his attention to the deepest trough of the Caribbean Sea.

Dr. Robert Ballard was aboard a 211-foot (64-meter) research vessel with dozens of other scientists to probe the Cayman Trough this week and collect samples of organisms they say might reveal how life might exist on other planets.

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U.S. Scientists Claim World's most Accurate Clock

U.S. scientists said Thursday they have built the world's most precise clock, whose ticking rate varies less than two parts in one quintillion, or 10 times better than any other.

The clock, made from the element ytterbium, could be used for technological advancements beyond timekeeping, such as navigation systems, magnetic fields and temperature.

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Study: Birds Sense Speed Limits on Roads

Birds sense posted speed limits on roads and react to avoid collisions, according to a study out Wednesday.

Researchers said birds appear to have adapted to the local speed limits as a feature of their environment, such as the risk of predators.

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Test-Tube Babies: A Simpler, Cheaper Technique?

Since the first test-tube baby was born more than three decades ago, in vitro fertilization has evolved into a highly sophisticated lab procedure. Now, scientists are going back to basics and testing a simpler and cheaper method intended mainly for developing countries.

In the West, many would-be parents spend thousands of dollars for IVF, which involves pricey incubators and extensive screening. But European and American scientists say a simplified version of the entire procedure aimed at developing countries could be done for about 200 euros ($265) with generic fertility drugs and basic lab equipment that would fit inside a shoebox.

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Scientists Find Another Flu Virus in Chinese Chickens

Scientists studying the H7N9 bird flu virus that has killed more than 40 people since March said Wednesday they had discovered another H7-type virus lurking in chickens in China.

Dubbed H7N7, the virus was able to infect mammals in a lab experiment, said the team, warning H7 viruses "may pose threats beyond the current outbreak".

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To Protect Amazon, Colombia Enlarges Nature Reserve

Colombia on Wednesday more than doubled the size of a huge nature reserve as it fights to protect the Amazon from deforestation.

Environment Minister Juan Gabriel Uribe said deforestation of the Colombian Amazon is a worrisome problem, mainly because of land being cleared for growing coca leaves, logging, illegal mining and agriculture.

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Study: Jumpy Caterpillar Shies the Sun

The larva of a Vietnamese moth has devised a unique form of transport -- constructing a leaf cone and thrashing about inside to make it jump, a study showed Wednesday.

Even more remarkably, the tiny caterpillar manages to steer its leafy vehicle in a clear direction along the forest floor -- but always away from the Sun, Canadian scientists wrote in the journal Biology Letters, published by Britain's Royal Society.

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Leaked Report: Human Activity Driving Climate Change

Human activity is almost certainly the cause of climate change and global sea levels could rise by several feet by the end of the century, according to an Intergovernmental Panel on Climate Change (IPCC) report leaked to media on Tuesday.

The draft summary of the report all but dismissed recent claims of a slowdown in the pace of warming, which has seized upon by climate-change sceptics.

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