Pulsars scintillate because their radio signals travel through space along multiple paths that interfere with each other. Researchers have used one of these scintillation-causing regions as an interstellar lens to localize the ‘black widow’ pulsar, B1957+20, near the phase in its 9.2-hour orbit at which its emission is eclipsed by its binary companion’s signal. During the lensing […]

Both total area burned by wildfires globally and the associated CO2 emissions have decreased since the 1930s as population density and cropland area have increased. Researchers quantified the effects of increasing cropland area and population density on wildfires between 1850 and 2014, and the associated impact on carbon uptake by land. They found that reduced […]

In the first study of its kind, geochemical evidence left behind in marine limestone sediment from Quebec’s Anticosti Island suggests a mass extinction that occurred more than 450 million years ago was caused by a period of global cooling that led to the world’s oceans abruptly losing life-supporting oxygen. The Late Ordovician Mass Extinction was […]

Whether you learn to play a musical instrument or speak another language, you’re training your brain to be more efficient. Researchers found that musicians and people who are bilingual utilized fewer brain resources when completing a working memory task. Individuals with either a musical or bilingual background activated different brain networks and showed less brain […]

Teeth from a 4,700-year-old domestic donkey skeleton from Israel reveal unevenly worn enamel that is indicative of bit wear. The findings suggest that bits may have been used to control donkeys in the ancient Near East as early as the third millennium, long before the arrival of the horse. This early evidence emphasizes donkeys’ significance […]

Cuckoo bees sneakily lay their eggs in the nests of other bee species, after which their newly hatched prodigies kill the host egg or larva, and then feed on the stored pollen. The host, a solitary bee, never knows anything is wrong. Nine new species of these clandestine bees were recently found in collections and […]

In the first population-level nuclear DNA analysis of a Native American group from ancient to modern times, the ancient genomes of coastal British Columbia’s and Alaska’s Tsimshian First Nations reveal that, 6,000 years ago, their population was slowly and steadily declining. The findings contradict popular belief that, after ancestors of today’s Indigenous North Americans crossed over the Bering Strait, […]

A recently discovered massive and extremely dense protocluster—the progenitor of a galaxy cluster—could be building one of the most massive structures in the universe today. Researchers surveying a region of the sky with the South Pole Telescope discovered a population of rare, extremely bright objects. Based on observations of carbon monoxide and ionized carbon emissions, […]

Children born to the youngest mothers have the highest risk of developmental vulnerabilities at age 5, largely due to socio-economic factors. Although the risk of developmental vulnerabilities declined with every additional year of a mother’s age up to 30 years, risk increased slightly for children born to mothers aged 35 years and older, similar to children […]

Researchers analyzed muscle biopsies of young adults with and without Type 1 diabetes who exceed Diabetes Canada’s recommended weekly levels for physical activity. They found structural and functional changes in muscle cells; power generation units, or mitochondria, of subjects with diabetes. The changes could result in reduced metabolism, greater difficulty controlling blood glucose and, if left […]

Deep convection in the Labrador Sea and the Atlantic Ocean have been unusually weak since the end of the Little Ice Age, about 170 years ago, compared to the previous 1,500 years. Researchers propose that, at the end of the Little Ice Age, freshwater from the Arctic and Nordic seas triggered this change in the […]

Raising the price of cigarettes benefits lower income people. In this study, researchers examined the impact of a 50 per cent increase in the cost of cigarettes on health, poverty, and financial protection in 13 middle-income countries. They found that higher tobacco prices provide more health and financial gains to the poorest 20 per cent […]

Annual marine heatwave days have increased by 54 per cent from 1925 to 2016, accelerating since 1982. Between 1925‒1954 and 1987‒2016, marine-heatwave frequency increased globally by 34 per cent and lasted 17 per cent longer. Researchers attribute this to a global increase in mean ocean temperatures and suggest that we can expect a continued global increase […]

A Homo sapiens fossil uncovered in the Arabian desert is estimated to be at least 85,000 years old—the oldest human fossil found to date outside of Africa and the Levant. The fossil finger bones were unearthed at Al Wusta, in Saudi Arabia. Original paper published April 9, 2018 Canadian co-author: Jay Stock, University of Western Ontario – jstock8@uwo.ca