Facebook removes 1.5 million horrific videos of New Zealand terror attack

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.

New Delhi, Feb 21: Global terror financing watchdog FATF on Friday decided continuation of Pakistan in the "Grey List" and warned the country that stern action will be taken if it fails to check flow of money to terror groups like the LeT and the JeM, sources said.

The decision has been taken at the Financial Action Task Force's plenary in Paris.

The FATF decided to continue Pakistani in the "Grey List". The FATF also warned Pakistan that if it doesn't complete a full action plan by June, it could lead to consequences on its businesses, a source said.

London, Jun 19: Malala Yousafzai, the youngest Nobel Peace Prize winner who once took a bullet for campaigning for girls' education in Pakistan, was over the moon on Friday after completing her degree in Philosophy, Politics and Economics at Britain's prestigious Oxford University.

Malala, 22, who attended Oxford's Lady Margaret Hall college, took to Twitter to share two pictures that show her celebrating the milestone with her family.

"Hard to express my joy and gratitude right now as I completed my Philosophy, Politics and Economics degree at Oxford," she said in the tweet, accompanied by two pictures - one showing her sitting with her family in front of a cake that says: 'Happy Graduation Malala', and the other in which she is covered with cake smiling for the camera.

Hard to express my joy and gratitude right now as I completed my Philosophy, Politics and Economics degree at Oxford. I don’t know what’s ahead. For now, it will be Netflix, reading and sleep. pic.twitter.com/AUxN55cUAf

— Malala (@Malala) June 19, 2020

In the tweet, the famed human rights activist also revealed her plans for the immediate future - Netflix, reading and sleeping.

"I don't know what's ahead. For now, it will be Netflix, reading and sleep," she wrote.

Malala was shot in the head by the Taliban militants in December 2012 for campaigning for female education in the Swat Valley in northeastern Pakistan.

Severely wounded, she was airlifted from one military hospital in Pakistan to another and later flown to the UK for treatment.

After the attack, the Taliban released a statement saying that they would target Malala again if she survived.

At the age of 17, Malala became the youngest recipient of the Nobel Peace Prize for her education advocacy in 2014 when she shared the coveted honour with India's social activist Kailash Satyarthi.

Unable to return to Pakistan after her recovery, she moved to Britain, setting up the Malala Fund and supporting local education advocacy groups with a focus on Pakistan, Nigeria, Jordan, Syria and Kenya.

The Taliban, who are against girls' education, have destroyed many schools in Pakistan.