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True or false: The most serious effects of lead exposure in children are vomiting and weight loss? Learn the answer by taking the Lead Safety Quiz.

Answer this one: Although mammograms can identify tumors at a very early stage, the tumors may have been growing for how long by the time they show up on the X-ray?

Nicotine, one of the main chemicals in tobacco, is the primary reason that smoking is so addictive. Even though most smokers know that smoking is bad for them, they find it difficult to quit because of the nicotine's effect.

Organic ingredients are grown and processed without artificial additives and used in a wide variety of products. Find out more about organic foods by taking this quiz.

Just because a medicine is available without a prescription doesn't mean it's safe to take. Take this quiz and learn the ins and outs of OTC medicines.

The carpal tunnel is a pathway inside your wrist that carries the median nerve from your arm to your hand. Carpal tunnel syndrome is a condition that affects your hand. Test your knowledge of carpal tunnel syndrome by taking this quiz.

True or false: If someone is following your car too closely, you should gently tap your brakes as a warning.

There are millions of pet cats in the U.S. Sometimes cats can cause an illness called cat scratch disease. Find out more about this illness by taking this quiz.

Celiac disease is a digestive disease that can affect children and adults alike. Also known as celiac sprue ("sprue" means you can't absorb nutrients from food), this disease is the most common genetic disease in Europe and is considered significantly underdiagnosed in the United States. Learn more about the disease by taking this quiz.