Girl nods off in April, wakes up in June!

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.

Kathmandu, Jul 24: At least 132 people lost their lives as a result of heavy rains triggering landslides, and flash floods in Nepal.

"132 people dead, 128 injured, 53 missing and 998 families affected due to rainfall, landslides and floods in the country as of 23rd July," Nepal Disaster Risk Reduction and Management Authority Within the last two weeks, the Myagdi district of western Nepal was the worst affected with 27 reported deaths.

Search and rescue operations are being conducted continuously with officials and police personnel who are looking through the debris to find missing people.

Monsoon-induced disasters are common in Nepal owing to the country's mountainous topography. Hundreds have been displaced as landslides have swept away their homes. They ended up taking refuge in local schools and community centers.

Nepal's Meteorological Forecasting Division earlier last week had predicted heavy downpour across the country. The Division had warned of monsoon winds being near the low-pressure line in the Terai belt, which would consequently cause more rainfall.

Washington, Apr 17: The confirmed coronavirus death toll in the United States reached 32,917 on Thursday, according to a tally by Johns Hopkins University.

The toll as of 8:30 pm (0030 GMT Friday) marked an increase of 4,491 deaths in the past 24 hours, by far the highest daily toll in the pandemic so far.

But the figure likely includes "probable" deaths related to COVID-19, which were not previously included. This week, New York City announced it would add 3,778 "probable" coronavirus deaths to its toll.

As of Thursday night, the US Centers for Disease Control and Prevention had recorded 31,071 coronavirus deaths, including 4,141 "probable" virus deaths.

The US has the highest death toll in the world, followed by Italy with 22,170 dead although its population is just a fifth of that of the US.

Spain has recorded 19,130 deaths, followed by France with 17,920.

More than 667,800 coronavirus cases have been recorded in the United States, which has seen a record number of deaths over the past two days.

Meanwhile, President Donald Trump unveiled plans Thursday evening to reopen the US economy, allowing each state's governor "to take a phased deliberate approach to reopening their individual states".