Basic principles of biology rather than women’s newfound economic independence can explain why fewer of them are getting married and having children, and why the trend may only be temporary, says a Queen’s researcher.
“Only in recent times have women acquired significant control over their own fertility, and many are preferring not to be saddled with the burden of raising children,” says Lonnie Aarssen, a Biology professor who specializes in reproductive ecology. The question is whether this is just a result of economic factors and socio-cultural conditioning, as most analysts claim, or whether the choices that women are making about parenthood are influenced by genetic inheritance from maternal ancestors that were dominated by paternal ancestors.”
Astronomers have found evidence that stars have been forming in a long tail of gas that extends well outside its parent galaxy. This discovery suggests that such "orphan" stars may be much more prevalent than previously thought.
The comet-like tail was observed in X-ray light with NASA's Chandra X-ray Observatory and in optical light with the Southern Astrophysical Research (SOAR) telescope in Chile. The feature extends for more than 200,000 light years and was created as gas was stripped from a galaxy called ESO 137-001 that is plunging toward the center of Abell 3627, a giant cluster of galaxies.
"This is one of the longest tails like this we have ever seen," said Ming Sun of Michigan State University, who led the study.
A group of computer scientists, mathematicians, and biologists from around the world have developed a computer algorithm that can help trace the genetic ancestry of thousands of individuals in minutes, without any prior knowledge of their background.
Unlike previous computer programs of its kind that require prior knowledge of an individual’s ancestry and background, this new algorithm looks for specific DNA markers known as single nucleotide polymorphisms, or SNPs (pronounced snips), and needs nothing more than a DNA sample in the form of a simple cheek swab. The researchers used genetic data from previous studies to perform and confirm their research, including the new HapMap database, which is working to uncover and map variations in the human genome.
Magnetars are small neutron stars that occasionally suffer extraordinarily powerful outbursts which shine X-rays across the galaxy.
In 2003, astronomers saw a neutron star brighten to around 100 times its usual faint luminosity. This outburst allowed them to discover XTE J1810-197. Detecting pulsations from the source helped classify it as the first transient anomalous X-ray pulsar (AXP). The massive outburst moved it to the rank of magnetar.
Magnetars are perplexing objects. Each one is the highly magnetic core of a star that was once at least eight times more massive than the Sun. When it exploded as a supernova, the core was compressed into a highly compact object, a neutron star, roughly fifteen kilometres in diameter, but containing about as much mass as the Sun.
Wind turbines are one of the most environmentally sound technologies for producing electricity. However, the removal and recycling phase of wind turbines has been identified as a blind spot in assessing their overall environmental impact.
Most studies have ignored this phase and focused entirely on their operation and in some cases the production and installation of wind turbines.
Danish researchers now suggest that in order to assess the overall environmental impact of wind power, however, the finite lifespan of wind turbines and the need to replace and recycle them must be taken into account.
The growth and conversion of biofuel crops could raise rather than lower greenhouse gas emissions, says a new study led by Nobel prize-winning chemist Paul Crutzen, best known for his work on the ozone layer.
He and his colleagues have calculated that growing some of the most commonly used biofuel crops releases around twice the amount of the potent greenhouse gas nitrous oxide (N2O, also known as ‘laughing gas’) than previously thought – wiping out any benefits from not using fossil fuels and, worse, probably contributing to global warming.