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What are vitamins and how do they work?
health.howstuffworks.com/wellness/food-nutrition/vitamin-supplements/question129.htm
What are vitamins and how do they work? What is the difference between vitamin A and vitamin C, for example? If I don't get enough vitamins, what happens?
What causes an ice cream headache?
health.howstuffworks.com/diseases-conditions/headache/question96.htm
Ice cream headaches are caused by a constriction of blood vessels in the roof of your mouth. Learn about ice cream headaches.
What causes flatulence?
health.howstuffworks.com/diseases-conditions/digestive/question46.htm
What causes flatulence?
What does it mean when someone has 20/20 vision?
health.howstuffworks.com/human-body/systems/eye/question126.htm
We all know 20/20 vision is a good thing, but just what do those numbers mean?
What is a cavity in a tooth? Why do they drill it?
health.howstuffworks.com/wellness/oral-care/problems/question106.htm
What is a cavity in a tooth? Why do they drill it? If a cavity is a hole, why would you drill it to make the hole even bigger?
What is a heart bypass operation?
health.howstuffworks.com/medicine/surgeries-procedures/question120.htm
What does it mean when someone has a heart bypass operation?
What is an appendix and what causes appendicitis?
health.howstuffworks.com/human-body/parts/question141.htm
What is an appendix and why can it be removed without causing a problem?
Why are boogers sticky?
health.howstuffworks.com/human-body/systems/nose-throat/question81.htm
My four-year-old asked, "Why are boogers sticky?" I really didn't know what to say...
Why do my ears pop when I dive in the deep end of the pool?
health.howstuffworks.com/human-body/systems/ear/question193.htm
Why do my ears pop when I dive in the deep end of the pool?