Why do the bubbles in stout beers such as Guinness sink instead of rising to the surface ?It is well known that the bubbles in a glass of stout rise in the center and sink at the sides, however it has always remained a mystery why this should be so. A new study however appears to hold the answer, and the key it seems is nothing more than the shape of the glass. "Because of the sloping wallof the pint, the bubbles are moving away from the wall, which means you"re getting a much denser region next to the wall," said Dr.
William Lee. "That is going to sink under its own gravity, because it"s less buoyant, and that sinking fluid will pull the bubbles down. You"ll see sinking bubbles not because the bubbles themselves are sinking, but because the fluid is and it"s pulling them down with it." Irish mathematicians may havesolved the mystery of why bubbles in stout beers such as Guinness sink: it may simply be down to the glass.
View: Full article | 
Source: BBC News
Views : 126
A teenage girl was filmed falling through a deep hole in the pavement that opened up beneath her.The oblivious girl was talking on her mobile phone when a sink hole opened up and she fell six feet in to the darkness below the street. The incident was both caught on security camera and witnessed by a passing taxi driver who stopped to help. Fortunatelyrescuers arrived on the scene shortly afterwards and the girl walked away from her ordeal with only a few minor injuries.
"The humiliation," she said. "You don"t know how many people are laughing at you."
A teenage girl in north China was walking on a pavement while talking on her mobile phone, when she fell - suddenly, and without warning - into a sinkhole six metres deep.
View: Full article | Source: Sydney Morning Herald
Views : 50
Over the next two days programmers from around the world will try to solve problems put forth by NASA.The aim of the event is to bring together coders from seven continents in an effort to advance space exploration and education. NASA officials have set out a number of problems to be solved including everythingfrom determining good landing sites on the Moon to investigating how the morale of astronauts could be improved by having them bake bread in space.
US space agency Nasa has launched a competition to find "space apps" to aid space exploration and education. The two-day event will bring programmers together on seven continents to see how creative they canbe with Nasa"s store of space data.
View: Full article | Source: BBC News
Views : 54
A 9-year-old has attributed divine intervention to his near miss with a bullet fired through his window.Preston Stevens was in his bedroom in Boston when he narrowly avoided being hit by a stray bullet that came through his window after claiming to have felt a mysterious force push him to one side moments before. The bullet was so close that itmade a hole in the jersey he was wearing yet managed to miss his torso.
Preston believes that he survived because God was looking out for him. A 9-year-old Boston boy says divine intervention saved his life when a bullet fired in the street outside his home came through his bedroom wall and left a smoking hole in the Boston Celtics jersey he was wearing.
View: Full article | Source: Huffington Post
Views : 70
82(82/0) 
