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.

People who have a drink or two prior to a traumatic event may suffer from more flashbacks than if they were either sober or drunk, said researchers.

A novel technique to kill parasites uses a combination of gold nanoparticles and lasers, and has been shown to work on Toxoplasmosis gondii - a common parasite that causes cysts in the brain.

In addition to the five tastes already identified lurks another detectable by the palate, fat, and people's weight is linked to their ability to taste it.

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 weak magnetic field and powerful solar wind stripped water from the early Earth's atmosphere 3.5 billions years ago and created stunning auroras, scientists said.

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.

Zinc from sunscreens can penetrate healthy adult skin, according to two Australian studies. The results raise questions over the safety of sunscreens containing zinc oxide nanoparticles – which may be dangerous in the body if still in a nanoparticle form.

A radar aboard an Indian spacecraft has detected craters filled with ice on the Moon's north pole, NASA scientists said.

The longer and earlier people use cannabis or marijuana, the more likely they are to experience hallucinations or delusions or to suffer psychosis, said Brisbane scientists.

A journey from Earth to Mars could eventually take just 39 days - cutting current travel time nearly six times - according to a rocket scientist who has the ear of U.S. space agency NASA.

At least a quarter of the star clusters in the Milky Way were born elsewhere and have migrated into our galaxy, researchers say.

Tiny tubes of boron nitride – similar to biological ion channels – could provide an alternative to desalination plants and may even lead to future treatments for cancer and cystic fibrosis, scientists said.

Small, domesticated dogs probably originated in the Middle East more than 12,000 years ago as the descendants of grey wolves.

Using the common painkiller ibuprofen may reduce the risk of developing Parkinson's disease, according to new research.

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.

Einstein's theory of relativity, which states that gravity affects the flow of time, just got 10,000 times more accurate.

Scientists used mobile-phone logs to track thousands of people's travel patterns, and found that we're almost all predictable. The data could be used in urban planning or even mobile phone applications.

Researchers have created a prosthetic foot that recycles the energy normally lost during walking, a development that could make it easier for amputees to walk.

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.

Babies who hear two languages regularly when they are in their mother's womb are more open to being bilingual, a study published this week in Psychological Science shows.

The celebrated Pharaoh Tutankhamun was subjected to modern genetic testing and computer technology to reveal that his parents were siblings and he was likely killed by malaria.