The Chicago Housing Authority has torn down all of its high rises and says it's close to completing its plans to transform public housing. Now, city leaders are moving to the next part of their plan: using public housing funds not just to build homes for poor families, but stores where they could shop and work. Some residents, however, say the city is breaking a promise to provide affordable housing.
It used to be that if astronomers wanted to get rid of the blurring effects of the atmosphere, they had to put their telescopes in space. But a technology called adaptive optics has changed all that.
Adaptive optics systems use computers to analyze the light coming from a star, and then compensate for changes wrought by the atmosphere, using mirrors that can change their shapes up to 1,000 times per second. The result: To anyone on Earth peering through the telescope, the star looks like the single point of light it really is.
Nelson Mandela, the former South African president and anti-apartheid leader, is in critical condition in a hospital in Pretoria where he was admitted two weeks ago with a recurring respiratory infection.
A statement from South African President Jacob Zuma said the 94-year-old Mandela's condition had become critical over the past 24 hours.
"The doctors are doing everything possible to get his condition to improve and are ensuring that Madiba is well-looked after and is comfortable. He is in good hands," said Zuma, referring to Mandela by his clan name.