Heavy metals are elements that are found in soil, water, and the air we breathe. Plants take up these metals as they grow and can end up in the food we eat. Our bodies need some heavy metals (like ...

Right ventricle (VEN-trih-kul): one of the four chambers of the heart. The right ventricle pumps blood low in oxygen to the lungs. In the lungs, the blood then gets a "refill" of oxygen.

What Is a Tear-Duct Blockage? A tear duct is a small tube that drains tears from the eyes. Tears are made in glands under the eyelids. They wash over the eyes to keep them moist and clean. Then, they ...

We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Now ...

A parked car in sunny weather is like a greenhouse and heats up very quickly. Even on a mild, sunny day in the 60s, the temperature in a parked car can get dangerously high. Every summer, there are ...

Viruses cause most diseases spread to people by mosquitoes. Malaria is caused by a parasite. Different mosquitoes carry different diseases. How common these illnesses are depends on where people live ...

This is a general outline of the milestones on the road to reading success. Keep in mind that kids develop at different paces and spend varying amounts of time at each stage. If you have concerns, ...

Girls have lots of questions about the body changes of puberty. When will my breasts grow? What's the "normal" age to get your first period? Watch this video and find out!

How Does Air Enter the Respiratory System? Air enters the respiratory system through the nose or the mouth. If it goes in the nostrils (also called nares), the air is warmed and humidified. Tiny hairs ...

Earaches are common in kids and can have many causes. Here’s why they happen and what to do when your child complains of ear pain. Give acetaminophen or ibuprofen as needed to ease pain (check the ...

Breastfeeding can take time and practice to get used to. Here's what you need to know about spitting up, gagging, and other concerns during breastfeeding. Is it Normal for My Baby to Spit Up After ...

Walking pneumonia is a less serious form of the lung infection pneumonia. It's often caused by bacteria called Mycoplasma pneumoniae, but other bacteria or viruses can also cause it. Most kids with ...