Alina Bradford

Hyenas don't laugh, and they are not related to dogs. They are a diverse group of mammals mainly found in Africa.

Kidneys are bean-shaped organs located on both sides of the spine, behind the stomach. Their main purpose is to keep the composition of blood in the body balanced to maintain good health.

Vertigo is a dizzying feeling of motion when no movement is present. It is often caused by an imbalance in the inner ear.

Ayahuasca tea has been used for centuries in healing ceremonies. It produces intense hallucinations, and has the attention of "ayahuasca tourists" as well as Western medicine.

The Endangered Species Act of 1973 was created to protect animals and plants that were in danger of becoming extinct. More than 2,200 species are listed as endangered or threatened.

The esophagus is a tube that connects the throat (pharynx) and the stomach. Within it, muscles contract to move food to the stomach.

Whiplash is a neck injury that is common in car crashes, but it can also be caused during other types of accidents. In the United States, over 2 million people suffer from whiplash each year.

A brain hemorrhage is bleeding in or around the brain. Brain hemorrhages occur when an artery in the brain bursts.

Bedwetting is common among young children. If it continues past age 7, there may be an underlying problem, and medical attention is recommended.

Flesh-eating bacteria refers to any of several strains of bacteria that can cause necrotizing fasciitis, a severe infection that destroys muscles, skin and tissue.

Ferrets are small, furry creatures with long tails and pear-shaped bodies. They are related to wolverines, ermines, minks and weasels.

Elk are related to deer, caribou and moose. However, they are broader than deer, but not as massive as moose.

The Zika virus is spread by bites of infected mosquitoes. It can be particularly dangerous to fetuses and newborns.

The large intestine, also called the colon, is part of the final stages of digestion. It is a large tube that escorts waste from the body.

Ovarian cysts are sacs of fluid that can grow on the ovaries. They are very common and usually are not life threatening. Sometimes, however, they can produce serious problems.

Sepsis is the body's overreaction to infection. It can cause tissue damage, organ failure and death.

A concussion is a traumatic brain injury (TBI) caused by the brain violently bouncing or twisting inside of the skull.

Traumatic brain injury (TBI) is a very common brain condition marked by damage to the brain caused by an outside force.

Kangaroos are marsupials native to Australia. Their babies are called joeys and they live in groups called mobs.

Research has found that exposure to blue light suppresses the production of the sleep hormone melatonin more than any other type of light.

Opioids are powerful painkillers but they can be dangerous with misuse.

Mercury is a naturally occurring chemical, but it can become harmful when it enters the food chain.

Some new mothers may be unfamiliar with basic breastfeeding practices. Here are some tips for them.