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How Fast Does Hair Grow?
health.howstuffworks.com/skin-care/hair-care/scalp-treatments/question251.htm
Anyone who's ever regretted a haircut has probably wondered how fast their hair will grow back. It's a good question, with a not-so-simple answer.
How Much Oxygen Does a Person Consume in a Day?
health.howstuffworks.com/human-body/systems/respiratory/question98.htm
How much oxygen does a person consume in a day?
How can an egg carton claim that the contained eggs have less fat and more vitamin E?
health.howstuffworks.com/wellness/food-nutrition/vitamin-supplements/question304.htm
I recently bought a carton of eggs that claimed, "These eggs are high in Vitamin E, contain 100 mg of Omega 3, and have 25% less saturated fat than regular eggs." How can you get chickens to lay these special eggs? And how can you tell which eggs have these properties without cracking them open?
How do antibiotics work?
health.howstuffworks.com/medicine/medication/question88.htm
Where do antibiotics come from, and how do they fight bacteria?
How does the sense of smell work?
health.howstuffworks.com/mental-health/human-nature/perception/question139.htm
What causes smell? When I walk into a bakery, I smell the bread. What actually has happened? Do objects give off pieces of matter? What has entered my nose to cause the sensation of smell?
How long can a germ live in a room?
health.howstuffworks.com/diseases-conditions/infectious/question235.htm
How long can a germ live in a room? My son had a friend over, and the friend was coughing all over the house. How long can his germs infect people?
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?