Oetzi, the 5,300-year-old "Iceman" mummy of the Alps, lived for some time after being shot in the back by an arrow, scientists said on Tuesday after using forensic technology to analyze his preserved blood.

Contrary to a leading theory, Oetzi did not expire immediately from his wounds, they reported in the Journal of the Royal Society Interface, published by Britain's academy of sciences.

Earthquake monitors, sound wave detectors and sensors on planes that pick up airborne traces of atomic material are all ways that global scientists will know within minutes if North Korea conducts a nuclear test.

The ability of global scientists to detect such events has improved since the hermit state's last two nuclear tests in 2006 and 2009. Scientists today, for example, have a larger network of worldwide seismology stations and more sensitive instruments, experts say.

Twenty Greenpeace activists chained themselves to an icebreaker in Helsinki's harbor on Wednesday in a bid to block Anglo-Dutch oil giant Shell's plans to drill for oil in the Arctic.

The activists want "to try to prevent the ship from leaving for Alaska by peaceful means," Greenpeace Nordic spokesman Juha Aromaa told Agence France Presse.

Scientists have long accepted that gas from farm animals is a major factor in climate change, but how do you stop cattle and sheep from doing what comes naturally?

That's the question consuming researchers in New Zealand who hope that by measuring every belch and bleat of their sheepish subjects they can come up with a solution.

Reef sharks have dropped sharply near populated islands in the Pacific Ocean, scientists said Friday.

The survey by the University of Hawaii showed that the numbers were drastically lower near populated islands in Hawaii, the Mariana Archipelago and American Samoa, compared to more pristine, remote areas in the ocean.

In a city understandably wary of low-flying aircraft, New Yorkers and tourists alike watched with joy and excitement Friday as space shuttle Enterprise sailed over the skyline on its final flight before it becomes a museum piece.

Ten years after 9/11, people gathered on rooftops and the banks of the Hudson River to marvel at the sight of the spacecraft riding piggyback on a modified jumbo jet that flew over the Statue of Liberty and past the skyscrapers along Manhattan's West Side.

European scientists said Friday they had detected a subatomic particle that sheds light on one of the basic forces of nature which determines the structure of matter.

The particle, a baryon called Xi_b, cannot be detected directly as it is too unstable, but scientists observed traces of it in a test at the European Organization for Nuclear Research's Large Hadron Collider (LHC).

A DNA analysis of four Stone Age humans in Europe published Thursday reveals how farmers likely migrated northward from the Mediterranean and eventually bred with hunter-gathers.

The research, by a Swedish-Danish team and published in the U.S. journal Science, sheds light on an oft-debated chapter of human history -- how did agriculture spread from the Middle East to Europe?

An Australian study of ocean salinity over the past 50 years has revealed a "fingerprint" showing that climate change has accelerated the rainfall cycle, according to a researcher.

The study published in the journal Science and conducted by Australian and U.S. scientists looked at ocean data from 1950 to 2000 and found that salinity levels had changed in oceans around the world over that time.

After two decades of examining a microscopic algae-eater that lives in a lake in Norway, scientists on Thursday declared it to be one of the world's oldest living organisms and man's remotest relative.

The elusive, single-cell creature evolved about a billion years ago and did not fit in any of the known categories of living organisms -- it was not an animal, plant, parasite, fungus or alga, they said.