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Due to rising pollution over the years, Los Angeles can be counted among the places with bad air quality. But a newly conducted study gave the details on how much the area has been changed in terms of quality of air, especially for its youngest residents.

Researchers associated with the study found that children in recent years breathed cleaner air and also had stronger lungs as compared to people studied two decades ago.

Research group said that improvement in the air quality is due to a drastic drop in the pollution in the Los Angeles basin, including the surrounding areas.

This was made possible after the air quality regulators made some strict rules regarding emissions from tailpipes and smokestacks.

According to a study published in the Journal of Dental Research, more than 2.4bn people have untreated tooth decay across the globe. Experts have raised concerns over neglect to this level when many ways do exist to treat and prevent it.

Dental decay often causes severe pain, infections and problems with child growth. Tooth decay is triggered when acids in the mouth begin dissolving the outer layers of teeth.

As many as 378 studies involving some 4.7m people between 1990 and 2010 were analyzed by Prof. Wagner Marcenes of Queen Mary University of London who led an international team of scientists. They deduced that 2.4bn people have untreated tooth decay in their permanent teeth and some 621m children have untreated decay in milk teeth.

On Wednesday, Cedars-Sinai Medical Center said that four patients have been infected with an antibiotic-resistant superbug linked to a type of medical scope.

The incident has taken place two weeks after a similar incident took place at Ronald Regan UCLA Medical Center. In the outbreak, seven patients became sick due to a superbug known as CRE after undergoing endoscopic procedures.

Cedars stated that since the time it has come to know about the ULCA outbreak, it has stopped conducting the procedures. The hospital said that it has launched an investigation. As per the hospital, the germ might have been passed from a duodenoscope made by Olympus Corp. during the procedures carried out between late August and January.

In a bid to improve the monarch butterfly population across the state, several Iowa organizations have joined hands to launch new efforts.

The Iowa Monarch Conservation Consortium has been established through efforts of the Iowa State University's College of Agriculture and Life Sciences, the Iowa Department of Agriculture and Land Stewardship and the Iowa Department of Natural Resources. The consortium will take necessary steps to enhance monarch butterfly population, which is declining in recent years.

Partners in the Iowa Monarch Conservation Consortium include state-wide farming and conservation organizations, agencies and companies.

Astronomers observed extremely far objects in the space to look back into ancient times. A photo of the sun from earth could show how the sun was about eight minutes ago as it takes about eight minutes to reach the light from the sun to earth. An observation of galaxy situated at a distance of billions of light years tells how the galaxy was about billions of years ago.

Astronomers observed galaxy A1689-zD1 as the light that the galaxy emits bent by a huge galaxy cluster Abell 1689 in the constellation Virgo nearly 2.2 billion light years away. According to astronomers, the galaxy formed an equivalent of 12 solar mass worth of new stars per year. The most surprising thing for astronomers was the dust that A1689-zD1 had.

According to Eight Analysts, the mean estimate for the short term price target for hardwood flooring major Lumber Liquidators Holding stood at $63.13. A New York lawmaker on Tuesday called upon the state to start an investigation regarding Lumber Liquidators to see if its China-sourced laminate flooring contains unsafe levels of formaldehyde.

Shares of Lumber Liquidators Holdings Inc. fell over the past week. As per market analysts, the drop was ignited by allegations of excessive formaldehyde in its flooring.

Analysts said that it is high time for the investors of the company to remain cautious as the stock might still face changes from its mean price. The higher price target estimate for the stock has been calculated at $110, whereas the lower price target estimate is at $47.