Although computer usage has not been conclusively shown to cause permanent damage to healthy eyes, there is evidence to suggest that small vision defects, which do not cause symptoms in everyday life, may start to cause problems when carrying out more visually demanding tasks.

BBC: Computer eye tests

The method also overcomes limitations posed by current treatments in which radiation may damage portions of healthy brain tissue.

ENGADGET: Researchers develop femtosecond laser that can diagnose, blast cancerous tumors

Since then, much as with Tony Blair in Britain (so far), Mr Clinton's greatest fiscal achievement has been to avoid doing damage to the fundamentally healthy economy he inherited from his political enemies.

ECONOMIST: Politics and the boom

The "precision" radiation also minimizes the damage to a patient's surrounding healthy tissue.

BBC: Radiotherapy mask

Which means that there might be some otherwise healthy kids out their risking damage to their bodies for no reason at all.

FORBES: The Biggest Unanswered Question About ADHD Drug Abuse

SBC's advice: If it ain't broke, don't fix it, because invasive inspections of healthy turbines actually increases the risks of damage.

FORBES: Energy

It was thought that having these mutations, to the BRCA1 and BRCA2 genes, could make healthy cells less able to repair any damage caused by radiotherapy.

BBC: Breast gene radiation fears eased

But a study out of Stanford University that looked at healthy aging runners found that running did not damage joints or leave runners less able to exercise.

CNN: No need to hang up your running shoes as you age

Firms must make sure that the goods they produce are safe for consumers, that their workers are healthy and that their factories and products do not cause damage to the environment.

ECONOMIST: The risk in nanotechnology

However, the researchers managed to produce two healthy baby mice from heated sperm, and genetic analysis suggested that no damage to the DNA had been suffered.

BBC: Sperm heating could foil HIV