Hackers have been holding the city of Baltimore's computers hostage. Survey says teenage girls have a declining interest in STEM careers. Freelancers are happy and prospering. Benjamin Rockwell explains the different types of servers. Hank Kee on what to do when a Windows computer is running with a mind of its own. Care and maintenance of computer equipment. What to do when a Windows PC cannot boot up cleanly. The NIH and the FDA disagree about wireless cell phone signals causing cancer. Marty Winston on his home television recording studio.