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Mars’ rivers flowed intensely and may have persisted as recently as one billion years ago, reveals a survey that found that the red planet’s rivers were wider than those on Earth today.
The study by scientists at the University of Chicago catalogued these rivers and found that significant river runoff persisted on Mars later into its history than previously thought.
According to the study, published in the Science Advances journal, the runoff was intense and occurred at hundreds of locations on the red planet.
These findings suggest that climate-driven precipitation may have taken place on Mars even during the time that researchers think the planet was losing its atmosphere and was drying out.
This complicates the picture for scientists trying to model the ancient Martian climate, said lead author Edwin Kite, Assistant Professor at the University of Chicago.
“It’s already hard to explain rivers or lakes based on the information we have. This makes a difficult problem even more difficult,” he said.
But, Kite said, the constraints could be useful in winnowing the many theories that researchers have proposed to explain the climate.
The survey used image data of well-preserved paleo-river channels, alluvial fans and deltas across Mars, and calculated the intensity of river runoff using multiple methods, including an analysis of the size of the river channels.
In the river basins, for which there is most data, Mars’ rivers were about two times wider than those on Earth.
Between 1 and 3.6 billion years ago, and likely after 1 billion years ago, there was intense runoff in these channels, amounting to 3 to 20 kg per square metre each day.
The runoff appeared to have been distributed globally, and was not a short-lived or localised phenomenon, the researchers said.
If the dates for these massive rivers are correct, the findings could suggest that Mars’ late-stage atmosphere disappeared faster than previously calculated, or that there were other drivers of precipitation under low-atmosphere conditions, the researchers noted. (IANS)
In a step towards digitisation of the system, Delhi Transport Department will soon issue QR based Smart cards for driving licenses (DLs) and registration certificates (RCs).
As per a statement, the new driving licence will have an advanced microchip with features like Quick Response (QR) code and Near Field Communication (NFC). The new RC will have the owner's name printed on the front while the microchip and the QR code would be embedded at the back of the card.
The cards earlier had embedded chips, but chip reader machines were not available in the required quantity with both the Delhi Traffic Police and the Enforcement Wing of the Transport Department. Moreover, chips were designed and implemented by the states concerned, which resulted in difficulties in reading the chip and retrieving information, especially in case of defaulters.
"Now with the QR based smart card, this issue is resolved. This will enable unification in linking and validating one's information to smart cards with Sarathi and Vahan, the two web-based databases of all driving licenses and vehicle registrations," the release added.
The QR is also being implemented nationwide, the QR code reader is easily procurable and will do away with the requirement of any manual intervention altogether. The new cards will also allow two specific materials for their card manufacturing -- PolyVinyl Chloride or PVC, or PolyCarbonate which is slightly more expensive but more durable. (Card Size - 85.6mm x 54.02 mm; Thickness minimum 0.7 mm)
An October 2018 notification of the Ministry of Road Transport and Highways (MoRTH) had made changes to the Driving License and Registration Certificate. The new Smart card based DL and RC, will have chip based/ QR code based recognition system. At the same time, documents such as driving license or registration certificates in electronic formats on DigiLockers and mParivahan were also made valid in place of physical documents and treated at par with original documents.
The QR code also has an added advantage of acting as a safety feature on the smart card. The department will be able to retain records and penalties of the DL holder for up to 10 years on the VAHAN database as soon as a driver/ owner's Smart card is confiscated. The new DLs will also help the government in maintaining records of differently-abled drivers, any modifications made to the vehicles, emission standards and the person's declaration to donate organs. (IANS/JB)
Keywords: Delhi, Driving License, Registration License, Digitisation.
LONDON — A work by British street artist Banksy that sensationally shredded itself just after it sold at auction three years ago fetched almost 18.6 million pounds ($25.4 million) on Thursday — a record for the artist, and close to 20 times its pre-shredded price.
"Love is in the Bin" was offered by Sotheby's in London, with a presale estimate of 4 million pounds to 6 million pounds ($5.5 million to $8.2 million).
After a 10-minute bidding war involving nine bidders in the saleroom, online and by phone, it sold for three times the high estimate to an undisclosed buyer. The sale price of 18,582,000 pounds ($25,383,941) includes an auction-house fee known as a buyer's premium.
The piece consists of a half-shredded canvas in an ornate frame bearing a spray-painted image of a girl reaching for a heart-shaped red balloon.
When it last sold at Sotheby's in October 2018, the piece was known as "Girl With Balloon." Just as an anonymous female European buyer made the winning bid — for 1 million pounds ($1.4 million) — a hidden shredder embedded in the frame by Banksy whirred to life, leaving half the canvas hanging from the frame in strips.
Sotheby's received some criticism at the time for failing to spot the hidden shredder. But the 2018 buyer decided to go through with the purchase, a decision that was vindicated on Thursday as the work's price soared. Image source: voa
Sotheby's received some criticism at the time for failing to spot the hidden shredder. But the 2018 buyer decided to go through with the purchase, a decision that was vindicated on Thursday as the work's price soared.
The work quickly became one of Banksy's most famous, and Sotheby's sent it on tour to cities including New York and Hong Kong before Thursday's auction.
Auctioneer Oliver Barker joked that he was terrified to bring down the hammer to end Thursday's sale. There were jitters among Sotheby's staff to the last that Banksy had another surprise planned.
Alex Branczik, Sotheby's chairman of modern and contemporary art, called the shredding "one of the most ingenious moments of performance art this century."
Banksy, who has never confirmed his full identity, began his career spray-painting buildings in Bristol, England, and has become one of the world's best-known artists. His mischievous and often satirical images include two male police officers kissing, armed riot police with yellow smiley faces and a chimpanzee with a sign bearing the words, "Laugh now, but one day I'll be in charge."
Several of his works have sold for multiple millions at auction. In March, a Banksy mural honoring Britain's health workers, first painted on a hospital wall, sold for 16.8 million pounds ($23.2 million) at a Christie's auction, until Thursday a record for the artist.
"Girl With Balloon" was originally stenciled on a wall in east London and has been endlessly reproduced, becoming one of Banksy's best-known images. (VOA/RN)
Keywords: Banksy, Artwork, Auction, Girl With Balloon, Sotheby
WASHINGTON — Suspected ransomware payments totaling $590 million were made in the first six months of this year, more than the $416 million reported for all of 2020, U.S. authorities said on Friday, as Washington put the cryptocurrency industry on alert about its role in combating ransomware attacks.
The U.S. Treasury Department said the average amount of reported ransomware transactions per month in 2021 was $102.3 million, with REvil/Sodinokibi, Conti, DarkSide, Avaddon, and Phobos the most prevalent ransomware strains reported.
President Joe Biden has made the government's cybersecurity response a top priority for the most senior levels of his administration following a series of attacks this year that threatened to destabilize U.S. energy and food supplies.
Avoiding U.S. sanctions
Seeking to stop the use of cryptocurrencies in the payment of ransomware demands, Treasury told members of the crypto community they are responsible for making sure they do not directly or indirectly help facilitate deals prohibited by U.S. sanctions.
Its new guidance said the industry plays an increasingly critical role in preventing those blacklisted from exploiting cryptocurrencies to evade sanctions.
The new guidance also advised cryptocurrency exchanges to use geolocation tools to block access from countries under U.S. sanctions. Image source: Photo by Jeremy Bezanger on Unsplash
"Treasury is helping to stop ransomware attacks by making it difficult for criminals to profit from their crimes, but we need partners in the private sector to help prevent this illicit activity," Deputy Treasury Secretary Wally Adeyemo said in a statement.
The new guidance also advised cryptocurrency exchanges to use geolocation tools to block access from countries under U.S. sanctions.
Hackers use ransomware to take down systems that control everything from hospital billing to manufacturing. They stop only after receiving hefty payments, typically in cryptocurrency.
Large scale hacks
This year, gangs have hit numerous U.S. companies in large scale hacks. One such attack on pipeline operator Colonial Pipeline led to temporary fuel supply shortages on the U.S. East Coast. Hackers also targeted an Iowa-based agricultural company, sparking fears of disruptions to grain harvesting in the Midwest.
The Biden administration last month unveiled sanctions against cryptocurrency exchange Suex OTC, S.R.O. over its alleged role in enabling illegal payments from ransomware attacks, officials said, in the Treasury's first such move against a cryptocurrency exchange over ransomware activity. (VOA/RN)
Keywords: Cryptocurrency, United States, Hacking, Ransomware