London, January 20: A new study led by Canadian researchers has lent more force to the belief that the evolution of `super sperm' depends upon competition.

While it is known that sperm from promiscuous chimps move faster than those from relatively monogamous gorillas, Ontario-based researchers at McMaster University in Hamilton have for the first time shown the same pattern among fish too.

Hamburg, Germany - Honey bees are more effective than insecticides in keeping harmful pests such as caterpillars away from your prize flowers, according to a team of German scientists.

Like winged watchdogs, honey bees chase away intruders who threaten to devour their beloved pollination buds. Not only do they chase away humans, but also other bugs.

Caterpillars are particularly sensitive to bees since the buzzing of the insects' wings irritates the sensitive hairs on their bodies.

Unable to tell apart a harmless bee and a predatory wasp, the leaf-munching larvae are frightened away, according to researcher Dr Jurgen Tautz, from the University of Wurzburg in Germany.

Washington, Jan 17 : In a new research, scientists have determined that temperature change in the Arctic is happening at a greater rate than other places in the Northern Hemisphere.

As a result, glacier and ice-sheet melting, sea-ice retreat, coastal erosion and sea level rise can be expected to continue.

The U. S. Geological Survey led this new assessment, which is a synthesis of published science literature and authored by a team of climate scientists from academia and government.

Washington, Jan 17 : A NASA-led report issued by the U. S. Climate Change Science Program has determined that scientists need to study how aerosols affect climate in order to produce better predictions of Earth's future climate.

Titled "Atmospheric Aerosol Properties and Climate Impacts," it is the latest in a series of Climate Change Science Program reports that addresses various aspects of America's highest priority climate research, observation and decision-support needs.

Washington, January 17 : A team of Canadian and American researchers has reached a step closer to developing effective treatments to prevent the brain from diseases like Alzheimer''s and Parkinson''s by identifying a gene that controls the normal and pathological aging of neurons in the central nervous system.

The team - comprising scientists from the Universite de Montreal, Maisonneuve-Rosemont Hospital, and Lawrence Berkeley National Laboratory - have revealed that the Bmi1 gene was identified while they were carrying out experiments on mice.

The researchers highlighted the fact that the primary risk factor for diseases like macular degeneration, Parkinson''s and Alzheimer''s is age.

London, Jan 17 : In a new study, a scientist has come up with the suggestion that global warming may be tackled with white paint.

According to a report in The Guardian, the scientist in question is Hashem Akbari from the Lawrence Berkeley National Laboratory in California, US, who suggests painting roads and the rooftops of buildings with the color white to fight global warming.