1.   Possibly the occasional spurious light ray causes a corresponding bad reading whose error is averaged out.

2.   They help deplete the ozone layer, allowing ultraviolet rays to cause deadly skin cancers.

3.   However, ultraviolet rays cause asphalt to degrade.

4.   In a bright sunny room the ultraviolet rays can cause the pigments, even permanent artist-quality pigments, to fade.

5.   The rays can cause skin cancer, cataracts and can damage immune systems and natural ecosystems.

6.   Those rays can cause skin cancer, cataracts and weakened immune systems in humans.

7.   Those rays can cause skin cancer, eye damage, skin wrinkling and premature aging.

8.   Previous epidemiological studies suggested that ultraviolet rays from sun lamps caused melanoma, one of the major forms of skin cancer.