The group, Ansaru, said the foreigners, who were kidnapped from a construction companyâ€™s compound in
February, were killed
to prevent rescue attempts.
About half of all
Americans never seek a second opinion about a diagnosis, treatment,
drug or operation, according to a 2005 Gallup poll. But if you
want a second opinion,
you needn't worry, says Orly Avitzur,
medical adviser to Consumers Union. Ã‚Â¶ Physicians are bound by a code of ethics to coop...BEIRUT â€” The Syrian regime of President
Bashar al-Assad warned Sunday that a series of powerful Israeli airstrikes near the Syrian capital
opened the door to â€œall the options,â€ underscoring the possibility that Syriaâ€™s civil war could spill across regional borders.
Read full article >> Daniel Sedin had a goal and an assist, and Cory Schneider made 32
saves in the Vancouver Canucks' 3-2
Louis Blues on
Hopeful signs coming out of the Big Ten? A North Carolina-Kansas matchup? One thing is certain: Kentucky will not be
around to defend its title.
the responsibility, accountability, organizational skills, and work ethic that I took from the class resulted from his high expectations for our
performance and his confidence in our success.â€
No reason to put the
fear of God into
your iPhone-loving kid. We can't comment on the brain rot, but a new study does show that children
who use cell phones have no greater risk of getting brain cancer than kids who don't use them, Reuters reports.
Logan Couture and Joe Pavelski scored goals 30 seconds apart
late in the third period
to help the San Jose Sharks clinch their ninth straight playoff berth with a come-from-behind
3-2 victory over the Dallas Stars on Tuesday night. Iâ€™m the
parent who chooses life and
a buzz cut over
endless hours with the fancy nit comb â€” even when the hair is my own. Ralf Speth criticises government subsidy of 'poor electric vehicles' and nationwide charging stationsElectric cars will never be a mass-market solution to climate change and should not get government subsidies, the chief executive of Jaguar Land Rover said on Tuesday .The
British and other governments have introduced generous subsidies to encourage motorists to switch to emission-free electric cars.Ralf Speth said it was wrong to subsidise "poor electric vehicles" and
nationwide charging stations. "At this time I am not a very big friend of electric vehicles," he said in an interview at the Geneva motor show."The
batteries are too
expensive â€¦the customer
must be very rich, and can only use [them] in
mega-cities [where there are charging points].
do it only for the rich?"He said it would be better to wait until the technology improves and there is a greater benefit to the environment.Speth,
who has been chief executive of Indian-owned Jaguar Land Rover since 2010, said the market should decide if electric cars are the future. "The customer is
clever enough to decide what he wants or doesn't
want," he said. "Even with lots of subsidy
the demand is not very high."Jaguar
Land Rover has developed an electric version of the Defender 4x4, but Speth said it would cost "five digits" more to
buy than the conventional version. The car unveiled at the motor
not be for sale.He said the carmaker would launch the world's first hybrid sports utility vehicle later this
year.Speth's comments came as Nissan underlined its commitment to build up to 50,000 Leaf electric cars in Sunderland. Andy Palmer, Nissan executive vice-president
and the most powerful Briton at the Japanese company, said northeast production of the Leaf would begin on 28 March.
He conceded that demand for electric cars has
been hampered by the high price of the vehicles and "range anxiety" â€“ people fear they may not be able to charge their cars if they go too far out
of town.But he said moving manufacturing from Japan to
Sunderland had allowed it to cut the price to Â£23,490 - truth about abs review
more than a similar petrol model.
The Â£23,490 retail price comes after a Â£5,000 government subsidy.Palmer
said range anxiety would reduce following the
government's commitment to invest
Â£37m in paying 75% of the cost
of new charging points at garage forecourts, supermarkets and homes."The UK
is really leading the way in electric cars, and we would like to see other governments picking up on that," he said.He said takeup of electric cars had been most extensive in Norway, where there is no
import tax on electric vehicles and the
country already has an extensive network of charging points
used to prevent
up in cold weather.
He said the Leaf is currently the 13th best-selling car in Norway.Automotive industryElectric, hybrid and
low-emission carsCarbon emissionsTravel and transportMotoringMotoringJaguar Land RoverRupert Neateguardian.co.uk © 2013 Guardian News and Media
Limited or its affiliated companies. All
rights reserved. | Use
of this content is subject to our Terms & Conditions | More Feeds The Supreme Court operates with almost no rules to guide - or constrain - behavior.
But why should it be subject to lesser ethics standards than lower courts? As recently as 5,000 years ago, the Sahara â€” today a vast desert in northern Africa, spanning more than 3.5
million square miles â€” was a verdant landscape, with sprawling vegetation and
numerous lakes. Ancient cave paintings in the region depict
hippos in watering holes, and roving herds of elephants and giraffes â€”
a vibrant contrast with todayâ€™s barren, inhospitable terrain. The Saharaâ€™s â€œgreenâ€ era,
known as the African Humid Period, likely lasted from 11,000 to 5,000 years ago,
and is thought to have ended abruptly, with the region drying back into desert within a span of one
to two centuries. Now researchers at MIT, Columbia University
and elsewhere have found that this abrupt climate change occurred nearly simultaneously across North Africa. The team
wet and dry periods over the past 30,000 years by analyzing sediment samples off the coast of Africa. Such sediments are composed, in part, of dust
blown from the continent over thousands of years: The more dust that accumulated in a given period, the drier the continent may have been. From their measurements, the researchers found that the Sahara
emitted five times less dust during the African Humid Period than the region does today. Their
results, which suggest a far greater change in Africaâ€™s climate than previously estimated, will be published in Earth and Planetary Science Letters.David
assistant professor in MITâ€™s Department of Earth, Atmospheric and Planetary Sciences, says the quantitative results of the study will help scientists determine the influence of dust
emissions on both past and present climate change. â€œOur results point to surprisingly large changes in how much dust is coming out of Africa,â€ says McGee, who did much of the work as a postdoc at Columbia.
â€œThis gives us a baseline for looking further back in time, to interpret how big past climate swings were.
This [period] was the most recent
climate swing in Africa. What was it like before?â€ Getting to the core of dustTo trace Africaâ€™s dust emissions through time, McGee analyzed sediment samples collected in 2007 by
researchers from Columbia and Woods
Hole Oceanographic Institution.
Researchers sampled from sites off the northwest coast of Africa, spanning a distance of more
than 550 miles. At each site, they collected a core sample â€” a 10-foot long cylinder
â€” which scientists submerged, collecting a column of sediment. McGee says a 10-foot column represents approximately 30,000 years of sediments deposited, layer
by layer, in
the ocean â€” sediments
dust from the continent, marine deposits brought in by ocean currents, and leftover bits of organisms that sank to the seafloor.
A centimeter of sediment corresponds to about 100 years of deposition, providing what McGee calls a â€œhigh-resolutionâ€
record of dust changes through time.To trace how much windblown dust accumulated over the past 30,000 years, McGee used a TradeMiner review
techniques to first
determine how fast sediments accumulated over time, then subtracted out the accumulation of marine sediments and biological remnants. Layer by layerUsing a technique called thorium-230 normalization, McGee and his colleagues calculated accumulation rates for sediment layers every two to three centimeters
along the column. The technique is
based on the
decay of uranium in seawater: Over time, uranium decays to
thorium-230, an insoluble chemical
that sticks to any falling sediment as it sinks to the seafloor. The
amount of uranium â€” and by extension, the production rate of
thorium-230 â€” in the worldâ€™s oceans is relatively constant. McGee measured the concentration of thorium-230 in each core sample to determine the accumulation rates of sediments through time.
In periods when sediments accumulated quickly, there was a smaller concentration of thorium-230. In slower-accumulating periods, McGee
greater thorium-230 concentration. Once the team calculated rates of sediment accumulation over the past 30,000 years, it went about determining how much of
that sediment was dust from neighboring Africa. The
researchers subtracted biological sediment from the samples by measuring calcium carbonate, opal and organic carbon, the primary remnants of living organisms. After subtracting this measurement from each sample layer, the researchers tackled the task of separating
sediment into windblown dust and marine sediments â€” particles that circulate through the ocean, deposited on the seafloor by currents. McGee employed a second technique
called grain-size endmember modeling, charting a distribution of
grain sizes ranging from coarse grains of dust to
fine grains of marine soil.
â€œWe define these endmembers: A pure dust signal would look like
this, and a pure marine sediment
would look like this,â€ McGee says. â€œAnd then we see, OK, what combination of those extremes would give us this mixture that we see here?â€ This study, McGee says, is the first
researchers have combined the two techniques
â€” endmember modeling and thorium-230 normalization â€” a pairing that produced very
precise measurements of dust emissions through tens of thousands of years.In the end, the team found that during some dry periods
North Africa emitted more than
twice the dust generated today.
Through their samples, the researchers found the African Humid Period began and ended very
abruptly, consistent with previous findings.
However, they found that 6,000
years ago, toward the end of this period, dust emissions were one-fifth todayâ€™s levels, and far less dusty than previous estimates.
McGee says these
new measurements may give
scientists a better understanding of how dust fluxes relate to climate by
providing inputs for climate models.
Natalie Mahowald, a professor of earth and atmospheric sciences at Cornell University, says the groupâ€™s combination of techniques yielded more robust
estimates of dust than previous studies. â€œDust is one of the most important aerosols for climate and biogeochemistry,â€ Mahowald says.
â€œThis study suggests very
large fluctuations due to climate over the
last 10,000 years, which has enormous implications for human-derived climate change.â€As a next step, McGee is working with collaborators to test whether these new measurements may help to resolve a longstanding problem: the inability of climate models to reproduce the magnitude of wet conditions in North Africa 6,000 years ago. By using
these new results to estimate the climate impacts of dust emissions on regional climate, models may finally be able to replicate the North Africa of 6,000 years ago â€” a region of grasslands that were host to a variety of roaming wildlife.â€œThis is a
period that captures peopleâ€™s imaginations,â€ McGee says. â€œItâ€™s
important to understand whether and how much dust has had an impact
on past climate.â€This research
was funded by the
Foundation and by a National Oceanic
and Atmospheric Administration postdoctoral fellowship to McGee. The spring exhibition at Wave Hill features seven contemporary artists who explore their fascination with and connection to the natural world. With caffeine
added to jelly beans, waffles, even
and gum, the Food and Drug Administration is stepping up efforts to investigate the impact on
Location: Pitcairn Island