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Sound moves through the air like the ripples you see after throwing a stone into a pond. Your ears collect these waves of sound around you and send them to your brain. This is how the parts of your ear work so you can hear.

As you age, some hearing loss is normal. You lose more than the ability to hear how loud a sound is. You also lose the ability to hear certain types of sounds. For example, you might not be able to hear some of the high-pitched sounds of a child's voice.

At the workplace, your employer measures noise with sound level meters and dosimeters. If the average noise exposure over an 8-hour work shift is 85 dB or higher, you need protection. OSHA requires your employer to have a hearing conservation program.

An audiometric test measures how well you hear. It's quick and painless. The Occupational Safety and Health Administration (OSHA) and your employer may require this test each year. Follow through with it. You can't "fail" a hearing test. The test results just help your employer know whether more hearing protection is required.

Learn about how earplugs and earmuffs can protect you from hearing damage.

How much do you know about protecting your hearing? Take the quiz to find out.

In hot environments, your body may have trouble keeping its temperature at a safe level. As a result, your body temperature rises to unsafe levels. This is heat stress. Heat stress can develop quickly. It can also be very dangerous to your health.

Your vision depends on how light is focused in your eye. A look at 3 common problems with focusing that make vision blurry: farsightedness, nearsightedness, and astigmatism.

High blood pressure is known as the silent killer" because it often has no symptoms. Left uncontrolled