Scientists keep finding new ways to play with cells and make them alter their behavior, even their identity.

FORBES: Cells Get a Makeover, Cancer Follows: A Path to New Therapies (and a Warning to Stem Cell Alchemists)

It's really the behavior that transmits the bacteria and not the identity of the individual.

NPR: Tracking a New Strain of Drug-Resistant Staph

Toulouse lawyer Eric Mouton, acting for a woman named only as Aicha, to protect her identity, told CNN she filed a complaint against Mohammed Merah in June 2010 over alarming behavior Merah displayed toward her children and herself.

CNN: France charges siege gunman's brother as an accomplice