WhatsApp co-founder Jan Koum to quit in loss of privacy advocate at Facebook

Washington, Jun 1: As protesters gathered outside the White House on Friday night in Washington DC, US President Donald Trump was briefly taken to the White House underground bunker, The New York Times reported citing a person having firsthand knowledge about the incident.

Trump was there for less than an hour before being brought upstairs. After hundreds of people surged towards the White House on Friday, Secret Service and the United States Park Police officers sought to block them.

Trump's team was surprised by the protests that were witnessed outside the White House on Friday night, according to the US daily. It is, however, unclear if Melania Trump and Barron Trump were also taken down with him.

in response to the continuing protests against the death of African-American man George Floyd in police custody.

National Guard members have been activated in 15 states and Washington, DC with another 2,000 prepared to activate if needed.

Demonstrators across the United States have been protesting since May 25, when George Floyd, a 46-year-old African-American man, died under the police custody in the city of Minneapolis.

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, Mar 11: Congress leader Rahul Gandhi on Wednesday accused Prime Minister Narendra Modi of “destabilising” the elected Congress government in Madhya Pradesh.

Gandhi also said the PM may have “missed” noticing the 35 per cent crash in global oil prices and asked him to pass on the benefit to Indians by slashing petrol prices.

“Hey @PMOIndia, while you were busy destabilising an elected Congress Govt, you may have missed noticing the 35 per cent crash in global oil prices.

“Could you please pass on the benefit to Indians by slashing #petrol prices to under 60 per litre? Will help boost the stalled economy,” the former Congress chief said on twitter.

Congress' prominent youth leader Jyotiraditya Scindia quit the party on Tuesday and appeared set to join the BJP amid a rebellion in Madhya Pradesh by his supporters, pushing the 15-month-old Kamal Nath government to the brink of collapse.

On Tuesday morning, as much of India was celebrating Holi, Scindia met senior BJP leader and Union Home Minister Amit Shah, following which he called on Prime Minister Narendra Modi at his 7, Lok Kalyan Marg residence.