2.4 million pilgrims in final Hajj rituals as global Muslims celebrate Eid

Prime Minister Narendra Modi, who had maintained silence on Chinese aggression and massacre of Indian in eastern Ladakh, now issued a statement saying ‘India wants peace’. He added that India is capable of giving a befitting reply if provoked. 

The prime minister started his meeting with chief ministers on the Covid-19 with a two-minute silence as a tribute to the 20 soldiers who were killed in action in Galwan Valley this week. As he spoke, it became clear that the message was aimed not just at reassuring the nation but also delivering a sharp message to Beijing.

“I would like to assure the nation that the sacrifice of our jawans will not be in vain. For us, the unity and sovereignty of the country is the most important,” PM Modi said. Home minister Amit Shah and defence minister Rajnath Singh were also present in the meeting.

Over twenty Indian soldiers were killed in the violent face-off which took place in Eastern Ladakh on Monday. The troops fought each other with fists and rocks. After the clash, the two sides “disengaged” from the area where the fighting happened, the Indian army statement said. A news agency quoting sources said four Indian soldiers are in critical condition after the face-off.

Defence minister Rajnath Singh mourned the death of 20 Indian soldiers. “The loss of soldiers in Galwan is deeply disturbing and painful. Our soldiers displayed exemplary courage and valour in the line of duty and sacrificed their lives in the highest traditions of the Indian Army,” he said in a statement.

“The Nation will never forget their bravery and sacrifice. My heart goes out to the families of the fallen soldiers. The nation stand shoulder to shoulder with them in this difficult hour. We are proud of the bravery and courage of India’s bravehearts,” the minister further said in the statement posted on Twitter.

These are the first Indian casualties in a border skirmish with PLA since October 1975 when Chinese troops ambushed an Indian patrol in Arunachal Pradesh’s Tulung La sector and shot four soldiers dead.

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.