Karnataka will burn if Haj Bhavan is named after Tipu

Bengaluru, Feb 6: A 33 -year-old techie who was on the run after allegedly bludgeoning her mother to death and attempting to murder her brother at their house near KR Puram early on Sunday was arrested along with her friend from a hotel in Port Blair, Andaman and Nicobar Islands, on Wednesday morning.

C Amruta and Sridhar Rao were produced before a court in Port Blair to get a transit warrant, deputy commissioner of police (Whitefield) MN Anuchet said. Police initially thought she had committed the crime as she was unable to repay a loan of Rs 15 lakh and feared being humiliated by the lenders.

"But now we strongly suspect that Amruta and Rao were in a relationship, which was opposed by her mother and brother. We don't see any other reason for her to attack her family members. We can get more details only after questioning the duo," another police officer said, adding, "The most important question is: Did Rao know Amruta was going to kill her mother? Or he got to know about it only later? He'd booked their air tickets to Port Blair on January 31 itself."

Rao and Amruta worked together in a software company in Whitefield till 2017. "Then they joined different firms and were in constant touch," police said.

Preliminary probe revealed the duo flew to Port Blair by catching a flight from Kempegowda International Airport (KIA) at 6.30am on Sunday. CCTV footage had shown Rao - wearing a full-face helmet and carrying a backpack - waiting near Amruta's house on a gearless scooter on Sunday morning. After she arrived, they chatted for a while before riding away. They arrived at KIA on the same bike, police said.

"We checked the passengers' list at KIA for that day and found Amruta's name. With the help of Port Blair police, we traced the duo to a hotel," an investigating officer said.

On Sunday morning, Amruta hit her 54-year-old mother C Nirmala on the head with a digging bar. She later stabbed her younger brother C Harish in the neck. Harish collapsed and thinking that he was dead, she left the house.

In his statement to police, Harish stated, "Around 4.30am, Amruta entered my room and stabbed me. I asked her what was wrong. She said she had a debt of Rs 15 lakh and didn't want the debtors to harass me and our mother."

The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study