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What does it mean when a barometer is rising or falling?
science.howstuffworks.com/nature/climate-weather/atmospheric/barometer.htm
A barometer is an instrument that is used to predict the weather. Learn about barometers in this article.
What does tear gas do?
science.howstuffworks.com/question340.htm
It is pretty common to hear someone on the news say, "The crowd was dispersed with tear gas." What is tear gas? What does it do?
What does the 'pursuit of happiness' mean in the Declaration of Independence?
science.howstuffworks.com/life/inside-the-mind/emotions/pursuit-of-happiness-meaning.htm
What exactly in the pursuit of happiness? Stated in the Declaration of Independence, it has some mystery behind it. Read about the pursuit of happiness.
What does the Army do at the Prototype Integration Facility?
science.howstuffworks.com/prototype-integration-facility.htm
Prototype Integration Facility helps build new tools for the U.S. military. Learn about the Prototype Integration Facility.
What does the Higgs boson look like?
science.howstuffworks.com/what-does-higgs-boson-look-like.htm
When something as important as the Higgs rocks our world, we want to know every last thing about it, including what it looks like. So?
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?
What exactly is a blueprint?
science.howstuffworks.com/engineering/architecture/question321.htm
If you've ever seen a construction site, you may have noticed that the general plans for construction are drawn out in the form of blueprints. What exactly are blueprints, though, and how are they made? Find out in this article.
What grade of steel was used in the World Trade Center?
science.howstuffworks.com/engineering/structural/grade-of-steel-used-in-world-trade-center.htm
The materials used to build the World Trade Center's twin towers have been heavily scrutinized since the 9/11 terrorist attacks -- including the steel that formed the frames of the skyscrapers.
What happens to abandoned mines?
science.howstuffworks.com/engineering/structural/abandoned-mine.htm
Abandoned mine shafts may look romantic with their clapboarded entrances and rusting pickaxes, but they can be deadly. So who ensures that these dangerous sites are properly closed up? You may find the answer a little unsettling.
What happens when animals evolve in isolation?
science.howstuffworks.com/life/evolution/evolve-in-isolation.htm
Speciation events are when members of the same species separate until they are no longer able to reproduce with each other. Learn more about speciation events.