This is WEEKEND EDITION from NPR News. I'm David Greene. This morning, Egyptians have their first-ever democratically elected president. Mohamed Morsi, the Islamist Muslim Brotherhood candidate has been declared the winner of hotly disputed election.
Human evolution is all about survival of the fittest. Over thousands of generations, the weak have been weeded out, and the strong have survived. But how would that kind of natural selection work in other settings - like, say, music? Well, one biologist decided to find out. He designed a website where listeners can rate collections of notes according to their musicality. The nice sounds survive, and other users listen to them. But the ugly sounds die off.
An Arizona law that went into effect last year essentially ruled that the Mexican-American studies program offered in the Tucson public school system was divisive and should be scrapped. At the end of the first semester without the classes, hard feelings still linger.
For eight years, until this past January, Lorenzo Lopez taught Mexican-American studies at Cholla High in Tucson, Ariz., the very school from which he graduated in 1992.