Washington, April 20 : In a new research, scientists have suggested that lead generated by human activities causes clouds to form at warmer temperatures and with less water, which could alter the pattern of both rain and snow in a warmer world.

The research has been done by an international team of scientists, which included researchers from institutions in the United States, Switzerland and Germany.

Washington, Apr 20 : Scientists from University of California, San Diego and the Moores UCSD Cancer Centre have identified a biomaker that may help predict aggressiveness of difficult-to-treat form of leukaemia.

The research team, led by Dr Paul A. Insel, professor of pharmacology and medicine at the UC San Diego School of Medicine, has found that high levels of a enzyme, called PDE7B, in the blood are an indicator that chronic lymphocytic leukemia (CLL) - the most common form of adult leukaemia.

London, April 20 : Zahi Hawass, Egypt's top archaeologist, has claimed that the tombs of legendary Queen Cleopatra and her Roman lover Antony have been found.

According to a report in the Telegraph, Hawass has claimed that the tombs of the two lovers are located at the Toposiris Magna temple in Egypt, where significant findings have been made.

London, April 20 : A new research has suggested that particles of lead from gasoline exhaust may have offset warming in the 20th century, causing global cooling.

It's well known that particles in the atmosphere such as mineral dust, pollen, heavy metals and even bacteria can act as seeds for the nucleation of ice crystals.

These crystals form clouds that can affect the Earth's energy balance by reflecting the sun's rays back into space, for example.

Washington, April 20 : Chewing Extra sugar-free gum may help control appetite, decrease calorie intake and reduce cravings for sweet snacks, a new study has found.

Researchers at the Pennington Biomedical Research Center and Louisiana State University found that chewing Extra sugar-free gum significantly reduced intake of an afternoon snack by 40 calories.

They also found that chewing gum specifically reduced sweet snack intake by 60 calories.

Hamburg  - The way to a lady's heart is through her stomach - if you're a male chimpanzee seeking a mate. But you have to be patient and feed her lots of meat over a long period of time, according to new findings by German scientists.

Wild female chimpanzees copulate more frequently with males who share meat with them over long periods of time, according to a study led by German researchers from the Max Planck Institute for Evolutionary Anthropology in Munich.