Washington, Apr. 2 : Expressing serious concern over the rising extremism in the country, the US Central Command chief General David Petraeus has said that religious extremists operating along the Pakistan-Afghanistan border pose a direct threat to Pakistan's existence.

Washington, April 2 : A scientist has identified an exoplanet that went undetected in Hubble images taken in 1998.

The scientist, David Lafreniere of the University of Toronto, Ontario, Canada, detected the planet that was hidden in Hubble images taken with the telescope''s Near Infrared Camera and Multi-Object Spectrometer (NICMOS) in 1998.

The planet, estimated to be at least seven times Jupiter''s mass, was originally discovered in images taken with the Keck and Gemini North telescopes in 2007 and 2008.

Washington, Apr 2 : Think you're doing your teeth a favor by sipping white wine instead of tea or coffee? Well, its time you rework the tooth-whitening mantra, for a new study has found that the transparent beverage increases the risk of dark dental stains.

In the study, NYU dental researchers compared two sets of six cow teeth, whose surface closely resembles that of human teeth, and used a spectrophotometer, an instrument that measures color intensities, to evaluate staining levels.

Washington, April 2 : Children who had low weight at the time of their birth may be at an increased risk of inflammatory processes in adulthood, which are linked with chronic conditions like heart disease and diabetes, according to a study.

While various studies have suggested that babies with lower weight at birth are at a higher risk for developing chronic diseases, there has been little understanding to explain why.

Washington, April 2 : Researchers at Scripps Institution of Oceanography at UC (University of California) San Diego have uncovered key clues about bioluminescent worms in the sea that produce a green glow and the biological mechanisms behind their light production.

Research conducted by Scripps marine biologists Dimitri Deheyn and Michael Latz reveals that marine fireworms use bioluminescence to attract suitors in an undersea mating ritual.

Washington, April 2 : Researchers at Scripps Institution of Oceanography at UC (University of California) San Diego have uncovered key clues about bioluminescent worms in the sea that produce a green glow and the biological mechanisms behind their light production.

Research conducted by Scripps marine biologists Dimitri Deheyn and Michael Latz reveals that marine fireworms use bioluminescence to attract suitors in an undersea mating ritual.