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A Shiite king ruled northern Syria more than a millennium ago from behind the towering walls of the citadel in Aleppo. In later centuries, Arab armies repelled medieval crusaders from the hilltop fortress, Mongol invaders damaged it and Ottomans used it as military barracks.
Almost a year ago, headlines proclaiming the sale of a largely complete T. rex-like dinosaur sparked an international custody battle that featured a confrontation at a public auction, a federal seizure of the fossils, charges related to smuggling against Eric Prokopi, the man who attempted to sell them — and, finally, his guilty plea.
Australia was first settled by between 1,000 and 3,000 humans around 50,000 years ago, but the population crashed during the Ice Age before recovering to a peak of some 1.2 million people around five centuries ago, a study said on Wednesday.
Estimating the early population of Australia is a source of debate in anthropology, partly because it touches on how European colonisation affected the country's indigenous people.
For close to 400 years, the painting was closed off to the world. For the past 124 years, millions of visitors walked by without noticing an intriguing scene covered with centuries of grime.
NASA and private sector experts now agree that a man or woman could be sent on a mission to Mars over the next 20 years, despite huge challenges.
The biggest names in space exploration, among them top officials from the US space agency and Buzz Aldrin, the second man to walk on the moon, will discuss the latest projects at a three-day conference starting Monday in the US capital.
The design of the ITER blanket system, a crucial technology on the way to fusion power, has been approved and is now ready to proceed to the manufacturing stage. "The development and validation of the final design of the ITER blanket and first wall technology is a major achievement on our way to deuterium-tritium operation—the main goal of the ITER project," says Rene Raffray, in charge of the blanket for the ITER Organization. "We are looking at a first-of-a-kind fusion blanket which will operate in a first-of-a-kind fusion experimental reactor.".
An extreme pair of superdense stars orbiting each other has put Einstein's general theory of relativity to its toughest test yet, and the crazy-haired physicist still comes out on top.
About 7,000 light-years from Earth, an exceptionally massive neutron star that spins around 25 times a second is orbited by a compact, white dwarf star. The gravity of this system is so intense that it offers an unprecedented testing ground for theories of gravity.
A passenger aircraft had a narrow miss with an unidentified object over Glasgow, a report has revealed.
A Swiss-made, solar-powered airplane called Solar Impulse completed an 18-hour flight from San Francisco to Phoenix on Saturday, marking the first leg of a fuel-free odyssey across America.
The London Psychiatry Centre has adapted a technology known as Transcranial Magnetic Stimulation, which focuses magnetic beams into the brain, to treat depression.
These pulses increase the activity of neurons in the brain and change a patient's mood.
In the wake of the marijuana legalization victories in Colorado and Washington last November, and buoyed by a series of national public opinion polls showing support for pot legalization going over the tipping point, marijuana reform legislation is being introduced at state houses across the land at levels never seen before.
For Rick Doblin, being invited to the Pentagon was an emotional experience. Growing up in the 60s, Doblin embraced the counterculture and protested the Vietnam war and the military-industrial complex behind it.
Yesterday he was at the Pentagon trying to persuade military medical officials to permit a clinical trial that would test MDMA, the active ingredient in the party drug Ecstasy, in conjunction with psychotherapy, in active duty soldiers with post-traumatic stress disorder.
“There’s been this history of conflict between psychedelics and the military, and we’re trying to say that’s not the only vision,” Doblin said. “There’s a way for us to come together.”
When a massive star exhausts its fuel, it collapses under its own gravity and produces a black hole, an object so dense that not even light can escape its gravitational grip. According to a new analysis by an astrophysicist at the California Institute of Technology (Caltech), just before the black hole forms, the dying star may generate a distinct burst of light that will allow astronomers to witness the birth of a new black hole for the first time.
Our Milky Way galaxy, and the billions of others beyond, is chock-a-block with extra-solar planets, scientists have learned in recent decades. But whether any of them can support life is a far more complex and contentious issue.
The Earth's atmospheric concentration of carbon dioxide (CO2) is about to rise to 400 parts per million (ppm) for the first time in five million years, a scientist at The University of Queensland warned today.
UQ Global Change Institute Director Professor Ove Hoegh-Guldberg said the record 400ppm level of atmospheric carbon was expected this week, according to readings at the US Government's Earth Systems Research Laboratory in Hawaii.
The UK Space Agency has announced that British scientists are now working with Nasa to develop the spacecraft, known as Sunjammer, which will use a 13,000 square foot solar sail to propel itself nearly two million miles towards the sun.
The sail will then help control the spacecraft in a steady position in orbit around the sun where it will act as a kind of forward observatory of the star at the centre of our solar system.
Scientists have found a way to use thin slices of graphene to convert solar energy to direct current electricity. The discovery could lead to a whole array of new applications, including a whole new method of creating a sustainable energy source to power buildings of the future.
Senior US government officials are to be briefed at the White House this week on the danger of an ice-free Arctic in the summer within two years.
The United Nations has put the Queensland and federal governments on notice that the Great Barrier Reef could be added to a list of endangered world heritage sites.
A record number of endangered manatees are dying in Florida's algae-choked waterways. So far this year, 582 manatees have died, more year-to-date than any year on record, according to preliminary numbers from the Florida Fish and Wildlife Conservation Commission (FWC).
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