Pneumonia. Pneumonia accounted for 15% of all under-five deaths and killed 920,000 children in 2015.

Retina. Light striking the retina triggers nerve impulses.

CHD. Coronary heart disease is caused by atherosclerosis, the buildup of fatty material in the arteries.

Doppler. "Doppler" comes from Austrian physicist Christian Doppler.

Larynx. The larynx is located at the level of the C3-C6 vertebrae.

United Kingdom. Down syndrome is the most common chromosomal disorder that causes mental retardation.

Union. Yoga is a word from Sanskrit, which is a liturgical language of Hinduism, Buddhism and Jainism.

Iatrophobia. Iatrophobia is considered one of the social phobias.

Parotid Gland Enlargement. Anorexia nervosa primarily affects adolescent females but approximately 10% of people diagnosed are male.

35 Million. Food is digested in the stomach in a period of 40 minute to a few hours.

Chemotherapy. Chemotherapy works by killing cells, such as cancer cells bone marrow and hair follicles, that divide quickly.

Under The Skin. Subcutaneous emphysema refers to a rare condition where air is trapped beneath the skin; it feels like Rice Crispies to the touch.

To Fix. Nephropexy is the surgical fixation of a kidney.

Heart Rate. Aerobic Endurance is the body's ability to exercise whole muscle groups over an extended period of time at moderate intensity, utilizing aerobic energy.

55 Percent-65 Percent. Water accounts for 55%-65% of our body weight, and must be replenished constantly because our bodies cannot store it.

Two. In 2008, consumers spent over $4 billion on Weight Watchers branded products and services.

Cancer. The number of new cancer cases is expected to rise by about 70% over the next two decades according to the World Health Organization.

Capillaries. The walls of capillaries are made of just a single layer.

Ascorbic Acid. Vitamin C is a water-soluble vitamin.

98.6 F. A humans body temperature is lowest during sleep.