CAPE CANAVERAL, Florida (Reuters) - Space Exploration Technologies aborted a test firing of its Falcon 9 rocket on Tuesday, in what was to be a key milestone in its quest to fly cargo -- and eventually astronauts -- to the International Space Station.

CAPE CANAVERAL, Florida (Reuters) - Space Exploration Technologies fired up the engines of its debut Falcon 9 rocket on Tuesday, a key milestone in its quest to fly cargo -- and eventually astronauts -- to the International Space Station.

LONDON (Reuters) - Britain risks decades of slow economic decline unless it invests heavily in research, which at the moment is one of the country's few genuine areas of economic competitive advantage, leading scientists said on Tuesday.

GENEVA (Reuters) - Dark matter, which scientists believe makes up 25 percent of the universe but whose existence has never been proven, could be detected by the giant particle collider at CERN, the research center's head said Monday.

LONDON (Reuters) - Vitamin D is vital in activating human defences and low levels suffered by around half the world's population may mean their immune systems' killer T cells are poor at fighting infection, scientists said on Sunday.

WASHINGTON (Reuters) - President Barack Obama will outline his administration's vision for space agency NASA and an eventual trip to Mars during a conference in Florida in April, the White House said on Sunday.

LONDON (Reuters) - Vitamin D is vital in activating human defenses and low levels suffered by around half the world's population may mean their immune systems' killer T cells are poor at fighting infection, scientists said on Sunday.

LONDON (Reuters) - A giant asteroid smashing into Earth is the only plausible explanation for the extinction of the dinosaurs, a global scientific team said on Thursday, hoping to settle a row that has divided experts for decades.

OSLO (Reuters) - Large amounts of a powerful greenhouse gas are bubbling up from a long-frozen seabed north of Siberia, raising fears of far bigger leaks that could stoke global warming, scientists said.

WASHINGTON (Reuters) - Can't lose weight on a low-fat diet? Maybe you need to cut carbs instead, and a new genetic test may point the way, maker Interleukin Genetics Inc reported on Wednesday.

CAIRO (Reuters) - Archaeologists have unearthed the intact sarcophagus of Egypt's Queen Behenu inside her 4,000-year-old burial chamber near her pyramid in Saqqara, chief archaeologist Zahi Hawass announced Wednesday.

SINGAPORE/ANCHORAGE (Reuters) - The world has become far too hot for the aptly named Exit Glacier in Alaska.

WASHINGTON (Reuters) - Can't lose weight on a low-fat diet? Maybe you need to cut carbs instead, and a new genetic test may point the way, maker Interleukin Genetics Inc reported on Wednesday.

WASHINGTON (Reuters) - Atrazine, one of the most commonly used and controversial weedkillers, can turn male frogs into females, researchers reported on Monday.

STAR CITY, Russia (Reuters) - Russia announced a halt to space tourism on Wednesday, saying it would struggle to ferry professional crews to the International Space Station after the U.S. mothballs its shuttle fleet this year.

CAIRO (Reuters) - Archaeologists have unearthed the intact sarcophagus of Egypt's Queen Behenu inside her 4,000-year-old burial chamber near her pyramid in Saqqara, chief archaeologist Zahi Hawass announced Wednesday.

DUBAI (Reuters) - Virgin Galactic is aiming to launch test flights into space in 2011, but does not need additional financing after selling a stake to Abu Dhabi's Abaar last year, its chief executive said on Wednesday.

LONDON (Reuters) - Families in some poor nations are trapped in cycles of illness and poverty as authorities fail to tackle chronic health problems or meet goals on child health and tuberculosis, scientists said on Tuesday.

VANCOUVER (Reuters) - Sustainable Energy Technologies Ltd, a solar equipment maker that recently relocated to Toronto from Calgary, may soon land its first large-scale orders in its new home province, the world's newest "go-to" region for solar power.

WASHINGTON (Reuters) - Atrazine, one of the most commonly used and controversial weedkillers, can turn male frogs into females, researchers reported on Monday.