1.   Doctors say the sulfur attaches to tiny soot particles that penetrate human lungs where it mixes with water to form a potent acid, damaging the tissues.

2.   Even during an eclipse, sunlight can damage eye tissue, Naeye said.

3.   If this tissue is damaged, it becomes thicker in some places and thinner in others, producing a nail with striations, or areas of uneven thickness.

4.   If the bone-cutting instrument strayed too close to the spinal cord, it might damage nerve tissue or injure arteries that run to the brain.

5.   If they go to the lung, they can damage tissue.

6.   In any event, at that point the skull had been fractured, tissue had been damaged.

7.   In the heart surgery, blood acts as a backstop to prevent the laser from damaging other tissue.

8.   It is believed that the small particles may be more dangerous because people can breathe them deeply into the lungs, where lung tissue can be damaged.

9.   Ozone, at ground levels, damages lung tissues and aggravates asthma.

10.   Over time, repeated blockages damage organ tissue.