The manner in which some viruses inject their DNA into bacteria or other types of cells appears to be much simpler than scientists had previously thought. Rather than using molecular engines or complicated mechanisms, viruses let simple physics do the work for them. This is a recent finding by Prof Willem Kegel from Utrecht University and colleagues from the University of California Los Angeles (UCLA), and the California Institute of Technology (Caltech). The results of their research were published in the scientific journal Physical Review X.