In the beginning, everything was free. Web sites like Google, Geocities and Webcrawler offered killer content without a single caveat. Then companies ranging from Yahoo to Sex.com remembered they were supposed to make money. Read more...

The next time you drive on the freeway, you may want to hold your breath. Two new UCLA studies show that people who live, work or travel within 165 feet downwind of a major freeway are exposed to potentially hazardous concentrations of particles, which may lead to future health problems. Read more...

UCLA scientists have identified a neurochemical mechanism in mice that is involved in helping them overcome fear. The researchers conducted a study on mice, by conditioning them to fear an audio tone. Read more...

Formerly conjoined twins Maria de Jesus and Maria Teresa had their expected trip home delayed because of “wound-care issues,” according to hospital officials. The girls were expected to fly home to Guatemala this week, but doctors at Mattel Children’s Hospital are keeping Maria de Jesus hospitalized to allow more time to recover from surgery to clean and close her scalp incisions. Read more...