1 - Certain kinds of heart imaging tests should be used cautiously to minimize patient exposure to ionizing radiation, which has been linked to cancer.

2 - It is illegal to expose patients to new medicines without being confident that they are likely to benefit and not be seriously harmed.

3 - Scientists have speculated that the destruction of Earth's ozone layer would expose us to damaging ultraviolet rays.

4 - Medical waste has been a growing concern because of recent incidents of public exposure to discarded blood vials, needles (sharps), empty prescription bottles, and syringes.

5 - In poor countries, lifetime exposure to health problems means that many people enter old age already in ill health.