(AP) -- Twitter Inc. and Japan's biggest homegrown social networking site mixi Inc. joined forces Wednesday to strengthen their ground against a rapidly expanding Facebook.

A comparison of home-birth trends of the 1970s finds many similarities – and some differences – related to current trends in home births.

(AP) -- The U.N.'s top climate scientist cautioned climate negotiators Wednesday that global warming is leading to human dangers and soaring financial costs, but containing carbon emissions will have a host of benefits.

As trees shed their foliage this fall, they reveal a mysterious, nearly universal growth pattern first observed by Leonardo da Vinci 500 years ago: a simple yet startling relationship that always holds between the size of a tree's trunk and sizes of its branches.  A new paper has reignited the debate over why trees grow this way, asserting that they may be protecting themselves from wind...

Structures in the midbrain that developed early in evolution can be responsible for functions in newborns which in adults are taken over by the cerebral cortex. New evidence for this theory has been found in the visual system of monkeys by a team of researchers from the RUB. The scientists studied a reflex that stabilizes the image of a moving scene on the retina to prevent blur, the so-termed...

Experts answer your questions about the science of biological building blocks

LiveScience.com - The 2011 Atlantic hurricane season was forecast to be a doozy and it delivered.

Gumby-like robot is able to squirm through small gaps under doors.

Engineers say they have developed a bone-like substance that can be created by 3D printers to create a scaffold for new bone tissue to grow over.

Twenty minutes with the vibrations from this dental device could reduce "brace-face" time.

Industry Minister Christian Paradis says Canadians should expect lower prices once Ottawa announces its decision on foreign ownership in the wireless sector and sets ground rules for the next sale of broadband space. But he isn't ready to make any announcements...

Could pond life meet the world's insatiable appetite for energy?

A deputy environment minister resigns to protest the Peruvian government's backing for the vast Minas Conga project, which seeks to produce 680,000 ounces of gold and 235 million pounds of copper annually

As global temperatures rise and climatic zones move polewards, species will need to find different environments to prevent extinction. New research, published today in the journal Molecular Ecology, has revealed that climate change is causing certain species to move and adapt to a range of new habitats.

China is due to hold its first AIDS Walk -- a fundraising walkathon already popular in the US -- on the Great Wall, organisers said Wednesday, as the nation steps up its fight against the disease.

Treatment with lapatinib could extend survival in women with Her2-positive breast cancer that has spread to the brain, according to research published today in the British Journal of Cancer.

Is there a psychological reason why people default on their mortgages? A new study, which will be published in an upcoming issue of Psychological Science, a journal of the Association for Psychological Science, finds that people with bad credit scores are more impatient – more likely to choose immediate rewards rather than wait for a larger reward later.

Scientists say they have solved in mice the mystery of how an unusual bacterium can trigger the common dental condition periodontitis while residing in low numbers in the space between tooth and gum.

(Medical Xpress) -- Virginia Commonwealth University researchers have found that an inflammatory mechanism known as inflammasome may lead to more damage in the heart following injury such as a heart attack, pointing researchers toward developing more targeted strategies to block the inflammatory mechanisms involved.

Australian freshwater turtle embryos can sense how developed other babies are in their eggs and then speed up their own growth to hatch with the most advanced of their siblings, according to new research.

LiveScience.com - A precise replica of a Stradivarius violin from 1704, made using X-ray images, may help scientists uncover the secrets of the instrument's unique and highly prized sound quality and also make it available to the average musician.

AP - A Spanish zoo spokeswoman says a young killer whale at the center of a legal battle waged by Dutch conservationists has arrived at its new home on the Canary...

China successfully launches an Earth observation satellite using a Long March 2C rocket - the first outing for the vehicle since it failed on a mission in August.

AP - The U.N.'s top climate scientist says global warming will lead to human dangers and soaring financial costs and that containing carbon emissions will have a host of...