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What are the organelles inside a cell and what do they do? And what are organelles anyway?

How do vaccines work? Are there different types?

What are the different kinds of pneumonia and how do doctors determine them? See for yourself on real X-rays!

What are viruses, bacteria, and fungus? How are they different from each other and how are they treated?

Why do we vomit? What are ulcers?

How are scarlet fever and strep throat related, and why aren't they as big a deal as they used to be?

What are ear infections and why do we get them?

What does the liver do and why does hepatitis matter?

A supplement to Follow the Oxygen - how exactly does the mitochondria convert oxygen into energy?

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