Once inside, hackers can do a lot of damage. To thwart intruders, CNS monitors network traffic with something similar to caller ID, looking for suspicious activity. They have other techniques, although Hinkel doesn't want to give away their detective secrets, for obvious reasons. He says that throughout industry most computer security vulnerabilities arise from inside the system, from disgruntled employees or careless users. Earth invaders don't have to be from Mars ORNL's several Earth Day activities included a talk, sponsored by the Environmental Sciences Division, by Daniel Simberloff, the University of Tennessee's Nancy Gore Hunger Chair of Excellence in Environmental Studies.
Exotic ornamentals can become scourges of native plants if they thrive in the wild.
Although some say that people pressures and pollution are the greatest threats to the Smokies, Simberloff argues that nonnative and introduced species have much more catastrophic potential. It doesn't take much. Forty years ago a boy visiting Hawaii casually picked up a few giant African snails and carried them back home to Miami. Most of the similar disasters Simberloff related haven't been taken care of so successfully. The Smokies' ongoing pig problems, for instance, stem from a hunting lodge's imported stock that got loose.