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A new study asking "Am I Normal?" analyzed penis size for 15,000 men and it reveals that a majority of men think that they have it smaller than average. According to experts, it is a perceived distortion of masculinity.

Dr. Abraham Morgentaler, associate clinical professor of urology at Harvard Medical School and founder of Men's Health Boston, has discussed with CBS about his latest book, "The Truth About Men and Sex: Intimate Secrets from the Doctor's Office".

It has been informed that the book explores male insecurity in the bedroom and also denies various common stereotypes of men being 'selfish' in bed. According to Morgentaler, behind closed doors, men are more worried about their capability to be provider for their sexual partners.

A team of researchers has found that spiders could actually be a source of pain relief in future. They said that the spider venom has thousands of proteins and certain helpful molecules that could be used in making powerful painkillers soon. More research is required on the project.

Researchers have discovered that the spiders have some proteins in their venom which results into the activation of pain pathways and cause paralysis and spasticity of muscle in the spider's prey. However, in the case of humans, spider bites can be dreadfully painful.

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.