Washington, April 21 : Scientists at the Cambridge University, UK, have discovered that freshwater algae can form stable groupings in which they dance around each other, resembling forms like waltz and minuet.

The researchers studied the multicellular organism Volvox, which consists of approximately 1,000 cells arranged on the surface of a spherical matrix about half a millimetre in diameter.

Washington, Apr. 21: President Obama greeted each member of the White Sox team during their tour of the White House on Monday.

Octavio Dotel, a relief pitcher from the Dominican Republic, asked for -- and received -- a hug instead of a handshake from Obama.

Washington, Apr. 21 : The Obamas are out to make new traditions at the White House, and helping them out this endeavour is their social secretary Desiree Rogers, Valerie Jarrett, a White House senior adviser, and Susan Sher, associate counsel and adviser to US First Lady Michelle Obama.

Since President Obama was sworn in on January 20 this year, the social office at the White House has run more than 60 events, with the Easter Egg Roll last week the most recent, a tradition on the South Lawn since 1878.

Washington, April 21 : Scientists at Harvard University, US, have found that tropical cyclones readily inject ice far into the stratosphere, possibly feeding global warming.

The finding provides more evidence of the intertwining of severe weather and global warming by demonstrating a mechanism by which storms could drive climate change.

Many scientists now believe that global warming, in turn, is likely to increase the severity of tropical cyclones.

Washington, Apr 21 : A surgeon has successfully removed a patient's lemon-size gallbladder through a single incision in the belly button.

Julie Kopec had her gallbladder removed via a minimally invasive procedure to operate inside the abdomen, and that too with no traces of a scar, less pain and a lower risk of infection.

Dr. P. Marco Fisichella, assistant professor of surgery, division of general surgery, Loyola University Chicago Stritch School of Medicine, Maywood, performed Kopec's surgery.

Washington, Apr 21 : After a hectic day of shopping in the mall, our memory guides us through a sea of vehicles in the parking lot to reach our car. Now, researchers have identified the specific parts of the brain responsible for solving this problem.

The findings of the study have implications for understanding the functional significance of a prominent brain abnormality observed in neuropsychiatric diseases such as schizophrenia.

Researchers explained that different types of memory are formed in different parts of the brain.