Washington, April 27 : Scientists have discovered a dinosaur tooth along what's now the Kakanaut River of northeastern Russia, a find that shows dinos once lived above the Arctic Circle.

Scientists say the dinosaurs became extinct 65 million years ago when a big meteor crash set off volcanoes galore, with dust and smoke filling up the air.

One theory holds that cold, brought on by the Sun's concealment, is what did them in, but a team of paleontologists led by Pascal Godefroit, of the Royal Belgian Institute of Natural Sciences in Brussels, argues otherwise.

Washington, Apr 27 : New York scientists have found that cutaneous application of nanoparticles, could offer a new means of delivering drugs to treat erectile dysfunction (ED).

The findings have revealed that topical treatments for ED could provide localized therapeutic results with the benefit of lower dosage and the avoidance of adverse side effects due to systemic absorption.

For the study, the researchers investigated a novel hybrid hydrogel/glass nanoparticle platform.

Hamburg  - Using 21st Century medical computer technology, German researchers have unveiled the "hidden face" below the surface facial features of the famed bust of 18th Dynasty Queen Nefertiti - dispelling once and for all nagging rumours that the bust might be a duplicate made at the orders of Adolf Hitler in the 1930s, and that the genuine bust was lost in the chaos following World War II.

London, Apr 26 : A team of researchers has claimed to have solved the mystery that intrigued the science world for decades: Whether or not fish feel pain?

And, the answer is yes. Just like humans, goldfish feel pain too.

Whilst the marine creatures can be seen to react to a jab or blow, experts have disagreed over whether the reaction indicates a sensation of pain, or is little more than a basic reflex.

Therefore, researchers, from Norway and the US, embarked on a study to set the record straight.

Washington, Apr 25 : A University of Arizona professor, who led NASA''s Phoenix Mars Mission, has said that within 10 years life will be found outside Earth.

Peter Smith held the audience spellbound in his lecture, "Journey of the Phoenix," on April 16 at the University of Delaware, as he shared images taken by the Phoenix Mars Lander, which touched down in the Martian arctic on May 25, 2008.

The event was a collaboration of numerous agencies and academic institutions, including the University of Arizona''s Science Operations Center, NASA''s Jet Propulsion Laboratory in Pasadena, Calif., and Lockheed Martin Space Systems in Denver, along with scientific institutes in Canada, Denmark, Finland, Germany, and Switzerland.

Washington, Apr 25 : American researchers have found how to turn off a certain receptor that promotes the growth of leukemia cells.

The study by researchers from the Children''s Cancer Hospital at The University of Texas M. D. Anderson Cancer Center has been presented in a platform session at the 22nd annual meeting of the American Society of Pediatric Hematology/Oncology (ASPHO).