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What does the filter on a cigarette do?
science.howstuffworks.com/innovation/science-questions/question650.htm
I have been smoking for 50 years and have always wondered why cigarettes have filter tips. I can remember when none of the cigarettes on the market had filters, and now nearly all of them do. Does the filter do anything?
How Does Relative Humidity Affect How I Feel Outside?
science.howstuffworks.com/nature/climate-weather/atmospheric/question651.htm
We hear about humidity in just about every weather report on the nightly news. There are several different ways meteorologists measure humidity, but relative humidity is the most common measurement. What is relative humidity, though?
How does chlorine work to clean swimming pools?
science.howstuffworks.com/innovation/science-questions/question652.htm
How does chlorine work to clean swimming pools?
What is a 'nervous breakdown'?
health.howstuffworks.com/mental-health/mental-disorders/question653.htm
What is a "nervous breakdown"? Find out what causes nervous breakdowns and how nervous breakdowns are treated at HowStuffWorks.
How does acupressure work?
health.howstuffworks.com/wellness/natural-medicine/alternative/question654.htm
When I get a headache, my friend presses a spot on my hand. Somehow, this makes my headache go away. How does this work?
How do CD-RWs rewriteable CDs work?
electronics.howstuffworks.com/question655.htm
Re-writable CD's are pretty amazing things. They were the first tools in the newest generation of personal music production.
What Is Déjà Vu?
science.howstuffworks.com/science-vs-myth/extrasensory-perceptions/question657.htm
Déjà vu is used to describe the feeling that you experienced a situation before. What causes this phenomenon? It's not a glitch in the matrix, but most of our knowledge on the subject is still theoretical.
Can You Power Your Computer or TV With a Bicycle Generator?
science.howstuffworks.com/innovation/science-questions/question658.htm
How to power a TV with a bicycle is explained in this article. Find out if you can power a TV with a bicycle.
How does a security passcard work?
computer.howstuffworks.com/question662.htm
Security passcards are often used to gain entry into areas and buildings with restricted access. Find out what data is kept an encoded security passcard and how they work.
How do astronauts function in their space suits for hours at a time?
science.howstuffworks.com/question544.htm
I would like to know how an astronaut, who is in a space suit for hours, can eat, drink and eliminate fluid- and solid-waste byproducts? What "mechanics" are built into the suit and how do they operate?