Turkey, US can turn Raqqa into ‘graveyard' for Daesh: Erdogan

San Francisco, Mar 14: Microsoft on friday announced that co-founder Bill Gates has left its board of directors to devote more time to philanthropy.

The 64-year-old stopped being involved in day-to-day operations at the firm more than a decade ago, turning his attention to the foundation he launched with his wife, Melinda.

Gates served as chairman of Microsoft's board of directors until early in 2014 and has now stepped away entirely, according to the Redmond-based technology giant.

“It's been a tremendous honor and privilege to have worked with and learned from Bill over the years,” Microsoft chief executive and company veteran Satya Nadella said in a release.

Nadella said Microsoft would continue to benefit from Gates' “technical passion and advice” in his continuing role as a technical advisor.
“I am grateful for Bill's friendship and look forward to continuing to work alongside him,” he added.

Gates left his CEO position in 2000, handing the company reins to Steve Ballmer to devote more time to his charitable foundation.

He gave up the role of chairman at the same time Nadella became Microsoft's third CEO in 2014.

Regularly listed among the world's richest people, William H. Gates was a geeky-looking young man when he and Paul Allen co-founded Microsoft in 1975.

Gates went on to turn his attention from software to fighting disease and other humanitarian challenges with his wife, under the auspices of the Bill and Melinda Gates Foundation.

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.

Washington DC, Jul 7: With US President Donald Trump promoting re-opening the economy, the country has now four epicentres of coronavirus instead of one -- Los Angeles, cities in Texas, cities in Florida and Arizona. This has led to the governors fearing that their hospitals could be overrun with patients.

"We are right back where we were at the peak of the epidemic during the New York outbreak...The difference now is that we really had one epicentre of spread when New York was going through its hardship. Now, we really have four major epicentres of spread -- Los Angeles, cities in Texas, cities in Florida and Arizona. Florida looks to be in the worst shape," Scott Gottlieb, former Food and Drug Administration commissioner was quoted by The Washington Post as saying in an interview.

As per the latest data, Florida, New York and California have crossed the 200,000 mark of coronavirus cases.

After Texas continued to break its own record of registering the highest number of coronavirus cases, Austin Mayor Steve Adler (D) was quoted as saying in an interview, "If we do not change this trajectory, then I am within two weeks of having our hospitals overrun."

He further said that intensive care units in the city will start overflowing within 10 days.

Echoing similar sentiments, Judge Lina Hidalgo, the top elected official in Harris County, said, "As long as we're doing as little as possible and hoping for the best, we are always going to be chasing this thing. We are always going to be behind and the virus will always outrun us...And so what we need right now is to do what works, which is a stay-home order."

She was stripped of authority to issue stay-at-home orders after Governor Greg Abbott decided to move forward with the reopening plan.

"It is clear that the (coronavirus) growth is exponential at this point...We have been breaking record after record after record... the last couple of weeks," Miami Mayor Francis Suarez was quoted as saying in an interview.

"The city of Miami was the last city in the entire state of Florida to open. I was criticized for waiting so long. But there is no doubt that the fact that when we reopened, people started socialising as if... the virus didn't exist."

He further said that if the numbers do not begin to fall "more drastic measures" will be taken in the coming week.

As per the latest update by the Johns Hopkins University, a total of 2,938,625 people in the US have tested coronavirus positive and 130,306 deaths have been reported so far.