'Avatar' plays on the big screen in Fort Worth

It's a big weekend at the Fort Worth Museum of Science and History. It begins showing Avatar on its IMAX screen Friday, so now, if you're in central Tarrant County, you don't have to drive forever to see it on a really big screen. And Friday through Sunday are Pi Days, in celebration of the numerical constant (3.14) and Albert Einstein's birthday, March 14. Pi activities are included with museum admission.