Astronomers discover 83 supermassive black holes 13 billion light-years away

New Delhi, Mar 14: Excise duty on petrol and diesel was on Saturday hiked by ₹3 per litre as the government looked to mop up gains arising from fall in international oil prices.

Special excise duty on petrol was hiked by ₹2 to ₹8 per litre incase of petrol and to Rs 4 incase of diesel, an official notification said.

Additionally, road cess on petrol was raised by ₹1 per litre each on petrol and diesel to ₹10.

The increase in excise duty would in normal course result in a hike in petrol and diesel prices but most of it would be adjusted against the fall in rates that would have necessitated because of slump in international oil prices.

Jan 13: For the first time in years, the government of India’s Prime Minister Narendra Modi is playing defense. Protests have sprung up across the country against an amendment to India’s laws — which came into effect on Friday — that makes it easier for members of some religions to become citizens of India. The government claims this is simply an attempt to protect religious minorities in the Muslim-majority countries that border India; but protesters see it as the first step toward a formal repudiation of India’s constitutionally guaranteed secularism — and one that must be resisted.

Modi was re-elected prime minister last year with an enhanced majority; his hold over the country’s politics is absolute. The formal opposition is weak, discredited and disorganized. Yet, somehow, the anti-Citizenship Act protests have taken hold. No political party is behind them; they are generally arranged by student unions, neighborhood associations and the like.

Yet this aspect of their character is precisely what will worry Modi and his right-hand man, Home Minister Amit Shah. They know how to mock and delegitimize opposition parties with ruthless efficiency. Yet creating a narrative that paints large, flag-waving crowds as traitors is not quite that easy.

For that is how these protests look: large groups of young people, many carrying witty signs and the national flag. They meet and read the preamble to India’s Constitution, into which the promise of secularism was written in the 1970’s.

They carry photographs of the Constitution’s drafter, the Columbia University-trained economist and lawyer B. R. Ambedkar. These are not the mobs the government wanted. They hoped for angry Muslims rampaging through the streets of India’s cities, whom they could point to and say: “See? We must protect you from them.” But, in spite of sometimes brutal repression, the protests have largely been nonviolent.

One, in Shaheen Bagh in a Muslim-dominated sector of New Delhi, began simply as a set of local women in a square, armed with hot tea and blankets against the chill Delhi winter. It has now become the focal point of a very different sort of resistance than what the government expected. Nothing could cure the delusions of India’s Hindu middle class, trained to see India’s Muslims as dangerous threats, as effectively as a group of otherwise clearly apolitical women sipping sweet tea and sharing their fears and food with anyone who will listen.

Modi was re-elected less than a year ago; what could have changed in India since then? Not much, I suspect, in most places that voted for him and his party — particularly the vast rural hinterland of northern India. But urban India was also possibly never quite as content as electoral results suggested. India’s growth dipped below 5% in recent quarters; demand has crashed, and uncertainty about the future is widespread. Worse, the government’s response to the protests was clearly ill-judged. University campuses were attacked, in one case by the police and later by masked men almost certainly connected to the ruling party.

Protesters were harassed and detained with little cause. The courts seemed uninterested. And, slowly, anger began to grow on social media — not just on Twitter, but also on Instagram, previously the preserve of pretty bowls of salad. Instagram is the one social medium over which Modi’s party does not have a stranglehold; and it is where these protests, with their photogenic signs and flags, have found a natural home. As a result, people across urban India who would never previously have gone to a demonstration or a political rally have been slowly politicized.

India is, in fact, becoming more like a normal democracy. “Normal,” that is, for the 2020’s. Liberal democracies across the world are politically divided, often between more liberal urban centers and coasts, and angrier, “left-behind” hinterlands. Modi’s political secret was that he was that rare populist who could unite both the hopeful cities and the resentful countryside. Yet this once magic formula seems to have become ineffective. Five of India’s six largest cities are not ruled by Modi’s Bharatiya Janata Party in any case — the financial hub of Mumbai changed hands recently. The BJP has set its sights on winning state elections in Delhi in a few weeks. Which way the capital’s voters will go is uncertain. But that itself is revealing — last year, Modi swept all seven parliamentary seats in Delhi.

In the end, the Citizenship Amendment Act is now law, the BJP might manage to win Delhi, and the protests might die down as the days get unmanageably hot and state repression increases. But urban India has put Modi on notice. His days of being India’s unifier are over: From now on, like all the other populists, he will have to keep one eye on the streets of his country’s cities.

Paris, Apr 17: Even as virologists zero in on the virus that causes COVID-19, a very basic question remains unanswered: do those who recover from the disease have immunity?

There is no clear answer to this question, experts say, even if many have assumed that contracting the potentially deadly disease confers immunity, at least for a while.

"Being immunised means that you have developed an immune response against a virus such that you can repulse it," explained Eric Vivier, a professor of immunology in the public hospital system in Marseilles.

"Our immune systems remember, which normally prevents you from being infected by the same virus later on."

For some viral diseases such a measles, overcoming the sickness confers immunity for life.

But for RNA-based viruses such as Sars-Cov-2 -- the scientific name for the bug that causes the COVID-19 disease -- it takes about three weeks to build up a sufficient quantity of antibodies, and even then they may provide protection for only a few months, Vivier told AFP.

At least that is the theory. In reality, the new coronavirus has thrown up one surprise after another, to the point where virologists and epidemiologists are sure of very little.

"We do not have the answers to that -- it's an unknown," Michael Ryan, executive director of the World Health Organization's Emergencies Programme said in a press conference this week when asked how long a recovered COVID-19 patient would have immunity.

"We would expect that to be a reasonable period of protection, but it is very difficult to say with a new virus -- we can only extrapolate from other coronaviruses, and even that data is quite limited."

For SARS, which killed about 800 people across the world in 2002 and 2003, recovered patients remained protected "for about three years, on average," Francois Balloux director of the Genetics Institute at University College London, said.

"One can certainly get reinfected, but after how much time? We'll only know retroactively."

A recent study from China that has not gone through peer review reported on rhesus monkeys that recovered from Sars-Cov-2 and did not get reinfected when exposed once again to the virus.

"But that doesn't really reveal anything," said Pasteur Institute researcher Frederic Tangy, noting that the experiment unfolded over only a month.

Indeed,several cases from South Korea -- one of the first countries hit by the new coronavirus -- found that patients who recovered from COVID-19 later tested positive for the virus.

But there are several ways to explain that outcome, scientists cautioned.

While it is not impossible that these individuals became infected a second time, there is little evidence this is what happened.

More likely, said Balloux, is that the virus never completely disappeared in the first place and remains -- dormant and asymptomatic -- as a "chronic infection", like herpes.

As tests for live virus and antibodies have not yet been perfected, it is also possible that these patients at some point tested "false negative" when in fact they had not rid themselves of the pathogen.

"That suggests that people remain infected for a long time -- several weeks," Balloux added. "That is not ideal."

Another pre-publication study that looked at 175 recovered patients in Shanghai showed different concentrations of protective antibodies 10 to 15 days after the onset of symptoms.

"But whether that antibody response actually means immunity is a separate question," commented Maria Van Kerhove, Technical Lead of the WHO Emergencies Programme.

"That's something we really need to better understand -- what does that antibody response look like in terms of immunity."

Indeed, a host of questions remain.

"We are at the stage of asking whether someone who has overcome COVID-19 is really that protected," said Jean-Francois Delfraissy, president of France's official science advisory board.

For Tangy, an even grimmer reality cannot be excluded.

"It is possible that the antibodies that someone develops against the virus could actually increase the risk of the disease becoming worse," he said, noting that the most serious symptoms come later, after the patient had formed antibodies.

For the moment, it is also unclear whose antibodies are more potent in beating back the disease: someone who nearly died, or someone with only light symptoms or even no symptoms at all. And does age make a difference?

Faced with all these uncertainties, some experts have doubts about the wisdom of persuing a "herd immunity" strategy such that the virus -- unable to find new victims -- peters out by itself when a majority of the population is immune.

"The only real solution for now is a vaccine," Archie Clements, a professor at Curtin University in Perth Australia, told AFP.

At the same time, laboratories are developing a slew of antibody tests to see what proportion of the population in different countries and regions have been contaminated.

Such an approach has been favoured in Britain and Finland, while in Germany some experts have floated the idea of an "immunity passport" that would allow people to go back to work.

"It's too premature at this point," said Saad Omer, a professor of infectious diseases at the Yale School of Medicine.

"We should be able to get clearer data very quickly -- in a couple of months -- when there will be reliable antibody tests with sensitivity and specificity."

One concern is "false positives" caused by the tests detecting antibodies unrelated to COVID-19.

The idea of immunity passports or certificates also raises ethical questions, researchers say.

"People who absolutely need to work -- to feed their families, for example -- could try to get infected," Balloux.