London, March 21: Using images from the Mars Odyssey spacecraft, NASA scientists have discovered what could be mud volcanoes on the planet, in which life might be bubbling in muddy squirts.

According to a report in New Scientist, Dorothy Oehler and Carlton Allen of NASA’s Johnson Space Center in Houston, Texas, identified dozens of mounds at a site in the northern plains of Mars that bear a striking resemblance to mud volcanoes on Earth.

These form a distinctive large hill of sediment with a central crater.

Washington, March 21: German researchers have found that cardiac arrhythmias are often accompanied by sleep-disordered breathing.

Thomas Bitter, from the Ruhr University in Bochum, used cardiorespiratory polygraphy to investigate whether 150 patients with atrial fibrillation, which included 110 men and 40 women, suffered from sleep-disordered breathing.

Only patients with normal systolic left ventricular function were included in the study, in order to avoid statistical bias.

Washington, March 21: Don’t run here and there in search of good life, for just being grateful to the people around you may fill your life with happiness.

Associate Professor, who teaches Psychology at George Mason University, has found that gratitude—the emotion of thankfulness and joy in response to receiving a gift—is the best way to achieve happiness.

Through a number of studies he has conducted, Kashdan has learnt that gender plays a role when it comes to achieving well-being, and that men are much less likely to feel and express gratitude than women.

Washington, Mar 21 : You can make a person laugh only in eight ways, says a leading evolutionary theorist who claims to have found the reason to why jokes are funny.

According to Alastair Clarke - who has published details of eight patterns he claims to be the basis of all the humour that has ever been imagined or expressed, regardless of civilization, culture or personal taste - he has identified the precise nature of the patterns involved, addressing the deceptively simple unit and context relationships at their foundation.

Indian Wells, California  - On-fire American Andy Roddick dismissed Novak Djokovic 6-3, 6-2 to send the defending champion out in the quarter-finals of the Indian Wells Masters on Friday.

The 68-minute rout improved Roddick's best start of his career. He stands 23-3 after playing in his fifth quarter from as many events in 2009.

Djokovic, who won Dubai last month but crashed to a pair of Davis Cup defeats a week later in Spain, was humbled in a little over an hour. Roddick ended each set with a break as the Serb lost serve four times.

Miami  - Russians Maria Sharapova and Nikolay Davydenko both withdrew on Friday from next week's Miami Masters with injuries as the American hard court season moves to its second major event of the month.

Sharapova, who underwent shoulder surgery last October, tried and failed to test her shoulder with doubles last week at Indian Wells, California, losing in the first round with partner Elena Vesnina.

Her return to the WTA now looks to be put back to Rome on clay in May.