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Why is 90 minutes of exercise per week the ideal amount?
health.howstuffworks.com/wellness/diet-fitness/exercise/90-minutes-of-exercise.htm
If you get 90 minutes of exercise per week, you help your heart significantly. Learn why it's important to get at least 90 minutes of exercise per week.
How Performance-enhancing Drugs Work
entertainment.howstuffworks.com/athletic-drug-test.htm
Performance-enhancing drugs are the frequent subject of controversy in the sporting world. Learn about performance-enhancing drugs and doping practices.
10 Ways Animals Supposedly Predict the Weather
Next time the cat starts sneezing, should you look for your umbrella or check her out for allergies? There are many superstitions out there about animals and weather prediction. Which ones hold water, and which ones are for the birds?
How Lithium-ion Batteries Work
electronics.howstuffworks.com/everyday-tech/lithium-ion-battery.htm
Lithium-ion batteries are incredibly popular these days. You can find them in laptops, PDAs, cell phones and iPods. Find out why.
10 Types of Microphones
electronics.howstuffworks.com/gadgets/audio-music/question309.htm
Microphones have been around in some form for more than 150 years. Modern mics incorporate fiber optics, microchips, and even lasers to suit a variety of audio needs.
How to Change a Fuel Filter
auto.howstuffworks.com/under-the-hood/vehicle-maintenance/change-fuel-filter.htm
Changing a fuel filter can be difficult without instruction. Learn how to change a fuel filter at HowStuffWorks.
How Formwork Works
home.howstuffworks.com/home-improvement/construction/materials/formwork.htm
Formwork is a tool used to mold concrete. Learn how formwork works in this article.
Top 10 Causes of Low Birth Weight Babies
There are many causes for low birth weight babies. Here are the top 10 reasons for low birth weight babies.
Can You Answer All of These Questions a Firefighter Should Know?
play.howstuffworks.com/quiz/can-you-answer-all-of-these-questions-a-firefighter-should-know
Fighting fires has been a priority since Roman times and likely even before, as skilled crews banded together to take on nature's most unpredictable element. Do you think you know everything a firefighter should know? Take the quiz and see!
Submarine Pictures
science.howstuffworks.com/submarine-pictures.htm
This submarine image gallery will give you an inside look into one of the Navy's most sophisticated war machines. Check out these submarine pictures.