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What is a keyhole satellite and what can it really spy on?
science.howstuffworks.com/question529.htm
On a television drama last week, the plot involved photos taken of a Russian missile silo, and the characters mentioned a "keyhole satellite." What is a keyhole satellite and what can it really spy on?
What is a levee?
science.howstuffworks.com/engineering/structural/levee.htm
Whether they make you think of Hurricane Katrina or Led Zeppelin, levees are a critical safety feature for low-lying areas located near water. Why do they break?
What is a nano quadrotor?
science.howstuffworks.com/innovation/science-questions/nano-quadrotor.htm
Seven million (and counting) YouTube viewers can't be wrong. Nano quadrotors are tiny, autonomous flying machines that have the Internet buzzing.
What is a provisional patent?
science.howstuffworks.com/innovation/new-inventions/provisional-patent.htm
Even though it's not even really an application, filing a provisional patent application can give you a head start as you begin the process of protecting your invention.
What is a punkin chunkin?
science.howstuffworks.com/transport/engines-equipment/question502.htm
A punkin chunkin is explained in this article. Learn about a punkin chunkin.
What is a tank engine, as in Thomas the Tank Engine?
science.howstuffworks.com/transport/engines-equipment/question275.htm
Thomas the Tank Engine is a merchandising phenomenon that includes small wooden train sets, video tapes, books, clothing, an official Web site and tons of fan sites. But wait, what exactly is a "tank engine" anyway?
What is a virus, and how does it become a danger to human life?
science.howstuffworks.com/life/cellular-microscopic/virus-danger.htm
A virus can be dangerous. Learn about virus dangers and what exactly is a virus. Get informed about virus dangers at HowStuffWorks.
What is a wavelength?
science.howstuffworks.com/what-is-wavelength.htm
Wavelengths are used to measure the size of a wave. Learn about wavelengths in this article.
What is activated charcoal and why is it used in filters?
science.howstuffworks.com/environmental/energy/question209.htm
Charcoal is carbon. Activated charcoal is charcoal that has been treated with oxygen to open up millions of tiny pores between the carbon atoms. What does this have to do with its absorbancy?
What is an atomic clock and how does it work?
science.howstuffworks.com/question40.htm
Many ads for new clocks advertise their ability to automatically synchronize themselves with the atomic clock in Boulder, Colorado. This atomic clock is more precise because it uses the frequencies of atoms as its resonator.