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How Does a Seismograph Work?
science.howstuffworks.com/environmental/earth/geophysics/question142.htm
A seismograph can accurately measure the movement of the Earth during a quake. How does a seismograph work, though, and what is the Richter scale that is associated with earthquakes? Learn the answers to these questions in this article.
Top 10 Ancient Chinese Inventions
science.howstuffworks.com/innovation/inventions/10-ancient-chinese-inventions.htm
The ancient Chinese brought us many great innovations, including some that we take for granted in the modern world. Let's examine 10 of ancient China's greatest inventions.
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