Traveling by air across the country or internationally can take a toll on your body -- particularly if you cross multiple time zones. Jet lag and muscle cramps are both common nuisances after plane travel. Luckily, these symptoms are typically not serious.

Consuming a wide variety of healthy foods helps you get the right amount of vitamins, minerals and other nutrients in your diet. Under some circumstances, people are unable to get enough of a specific vitamin through their normal diet and opt to supplement.

Behavior modification techniques include a series of teacher-implemented activities and actions aimed at improving classroom behavior. Encouraged behaviors might include staying seated, requesting permission to talk, remaining on task, proper care of classroom books and tools, and treating other students with respect.

In a 9-month-old, a fever is usually due to a viral infection or the common cold, according to MayoClinic.com. As the body fights the infection, her body temperature rises. If your 9-month-old has a fever, it’s important to keep her hydrated and watch for warning signs.

Cholesterol and cholesterol esters are more similar than they are different; however, when considering their similarities several distinctions begin to arise. Cholesterol esters are derived from cholesterol itself.

From infancy to late life, nutritional needs change. Children must grow and develop, while older adults must counter the effects of aging. The importance of age-appropriate nutrition during all stages of the life cycle cannot be overlooked.

Anorexia is a serious eating disorder characterized by a refusal to maintain a body weight within 15 percent of your ideal weight.

The shoulder can rotate to 180 degrees, according to the American Academy of Family Physicians. This flexibility, however, also makes the shoulder susceptible to injuries and pain. Rotator cuff tears, clavicle fractures and dislocations may require surgical intervention for repair.

Babies are especially susceptible to developing upper respiratory infections that can cause coughs because they put everything in their mouths and are often around other young children who carry germs on unwashed hands. According to the Mayo Clinic, babies commonly experience 8 to 10 colds in the first two years.

Also called Bacopa monniera or water hyssop, brahmi is a water-loving marsh plant that grows natively in India and its leaves and stems are used in medicinal preparations. You might take brahmi to improve your mental function and memory.

Prostate specific antigen or PSA is a specific antigen produced by the prostate. Levels of this antigen are measured to determine the presence of disease. PSA can determine the presence of prostate cancer, benign prostatic hypertrophy and prostatitis.

Progesterone is a sex hormone made by the body. It is synthesized from cholesterol, and its production and regulation are under the control of complex processes in the endocrine and reproductive systems. The adrenal glands produce small amounts of progesterone at a relatively constant rate.