Washington  - The United States will push for more restrictions on tourism to the North and South Poles to protect the regions' natural environment and avoid the worst effects of global warming, US Secretary of State Hillary Rodham Clinton said Monday.

Opening a nearly two-week summit bringing together the two diplomatic bodies that govern the Arctic and Antarctic, Clinton warned that protecting the region was crucial to stabilizing the global climate.

Washington  - Newspapers on Monday published the first photographs of the flag draped casket of a killed member of the military being returned to the United States since a ban on the images went into effect in 1991.

A military honour guard was seen carrying the casket of Air Force Staff Sergeant Phillip Myers off an airplane at Dover Air Force Base in Delaware late Sunday. He was killed by a roadside bomb in Afghanistan on Saturday.

Washington, April 6 : Two months after her alleged bust-up with boyfriend Chris Brown, Rihanna is `back to herself', according to her dad.

The `Umbrella' hitmaker is in native Barbados to celebrate her grandparents'' 50th wedding anniversary.

And Rihanna's father Ronald Fenty was pleased to find his daughter in a positive spirit following her well-publicised fight with Brown, who is said to have attacked her.

"Of course, I''m happy to have her home. Things are good with her," Contactmusic quoted Fenty, as telling Usmagazine. com.

Washington, Apr 6: Scientists have successfully used the African frog Xenopus as a tool to identify important clues about the effects of maternal consumption of alcohol in early pregnancy.

As the Xenopus embryos are large, easy to work with and very responsive to environmental cues, they make for ideal instruments to understand early vertebrate development.

Foetal alcohol spectrum disorder (FASD) and Foetal alcohol syndrome (FAS) cause malformations in babies, including facial defects, short stature, and mental and behavioural abnormalities.

Washington, April 6: Boston University scientists say that they have discovered a new family of biologically active products of omega-3 fatty acids, which can resolve periodontal inflammation and restore the gums to health.

The researchers point out that oil from fish contains eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), both of which are omega-3 fatty acids.

They underscore the fact that these omega-3 fatty acids are often used to help people with various inflammatory conditions.

Washington, April 6: Three-day-old broccoli sprouts, a widely available human food, could prevent stomach cancer by suppressing Helicobacter pylori (H. pylori) infections, according to a new study.

H. pylori infections are one of the most common bacterial infections worldwide and can lead to stomach cancer.

For the study, researchers enrolled 48 Helicobacter-infected Japanese men and women and randomly assigned them to eat 70 grams of fresh broccoli sprouts daily for eight weeks or an equivalent amount of alfalfa sprouts.