National

Technology to filter photos in Web searches may help the Justice Department curb online trafficking in child pornography. The department has thus far focused its efforts on prosecution, not prevention. iStockphoto.com hide caption

For women who carry certain genes, getting a double mastectomy before anything shows up on a mammogram may reduce breast and ovarian cancer risk. Damian Dovarganes/AP hide caption

Eggs themselves are remarkably resistant to germs like salmonella. The shell and proteins in the egg white normally do a good job of fending off pathogens. But eggs laid by a bird infected with salmonella will likely be infected, too. Courtesy of John Ingraham hide caption

Google has created a new priority inbox system for its Gmail service. The new system sorts through your messages and puts the important ones in a separate box called Important. hide caption