Men are more than twice as likely as women to be sexually active in old age, and more likely to report it as "good quality", says a study published by the British Medical Journal.

DNA from the fossilised eggshells of extinct birds - including iconic giants such as the moa and elephant bird - have been extracted for the first time.

Scientists have uncovered the bones of a dinosaur-like creature that roamed Earth at least 10 million years earlier than the oldest known dinosaur, according to a recent study.

A census of microbes in the human digestive tract found at least 1,000 microbes, many previously unknown, and could lead to new cure for gut ailments with the help of personal microbial profiles.

Can life arise from nothing but a chaotic assortment of basic molecules? The answer is a lot closer following a series of ingenious experiments that have shown evolution at work in non-living molecules.

Healthy bottlenose dolphins appear to turn on and off a diabetes-like state: a trick that may open to door to a treatment for the disease in humans.

The retreat of glaciers and the loss of moisture from soil due to climate change will likely increase the number of large-scale dust storms, such as those that blanketed Sydney in 2009, scientists predict.

Scientists peered into the brain of an adolescent finch as it listened to the warble of an adult brain and saw the cells changing, which may provide insights into the learning process.

The first global agreement to conserve migratory sharks, including great white and whale sharks, was signed in Manila, but no management plan was put in place.

The Sundaland clouded leopard, a newly identified and little understood species of big cat in Borneo, has been captured on camera for the first time.

A drop in global oxygen levels may have led to air-breathing marine animals 375 million years ago, said scientists, challenging the theory that it evolved in frolicking freshwater fish.

Finnish researchers called for a revision of climate change estimates after their findings showed emissions from soil would be up to 50% higher than previously thought.

Researchers have found the trigger that activates sperm to start them swimming, which could lead to a male contraceptive and also explain the link between marijuana use and sperm damage.

The father of evolution Charles Darwin was a direct descendant of the Cro-Magnon people, whose entry into Europe 30,000 years ago heralded the demise of Neanderthals, scientists revealed.

Quantum effects are used to absorb and move around light energy during photosynthesis, scientists said, and its the first time such long-lived effects have been seen in this temperature range.

Unlike their more selfish chimpanzee and human cousins, bonobos never lose the capacity to share with their friends, a study has found.

Fifty-five nations have registered their commitments to combat global warming, providing a much-needed boost to December's Copenhagen Accord.

Healthy older adults need less sleep than their younger counterparts and, even with less sleep under their nightcaps, are less likely to feel tired during the day, scientists said.

Scientists have recreated the intense temperatures and pressures at the centre of stars, a major milestone towards controlled nuclear fusion - potentially a limitless carbon-free source of energy.

The key anomaly in the Australian megafauna debate has been resolved, and "if people hadn't arrived in Australia, we'd still have the giants of yesteryear to admire," the lead researcher said.

Researchers transformed mouse skin cells directly into functional nerve cells, skipping the stem cell stage, in a huge step towards treating diseases such as Alzheimer’s or spinal cord injuries.

The controversial link between oral infections during pregnancy and stillborn babies has been definitively proven by a team of American researchers.

The head of the U.N.'s climate science panel confirmed the doomsday prediction of Himalayan glaciers disappearing by 2035 as an error but said he would not resign over the blunder.

Large, flightless birds such as ostriches and emus, originated in the northern hemisphere, according to an Australian study that suggests they became grounded after dinosaurs went extinct.

Madagascar's magnificent menagerie of mammals arrived tens of millions of years ago on natural rafts carried by storms and currents, and not across land bridges as some scientists contend.