Search Results | coal mining in the united states
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How Tunnels Work
science.howstuffworks.com/engineering/structural/tunnel.htm
Constructing a tunnel is one of the most complex challenges in the field of civil engineering. Learn about the basics behind tunnels.
How Cellulosic Ethanol Works
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Cellulosic ethanol could provide us with a new, green source of energy. Learn all about cellulosic ethanol at HowStuffWorks.
How a Nuclear Reactor Works
science.howstuffworks.com/nuclear-reactor.htm
Over the years, nuclear reactors have been viewed as both a miracle and a menace. How does a nuclear reactor do its job? And what happens when something goes wrong?
Railroad Expansion
history.howstuffworks.com/american-history/railroad-expansion.htm
The railroad expansion of the middle and late 1800s changed America forever. Read more about the westward expansion of railroads.
Old Railroads
history.howstuffworks.com/american-history/old-railroads.htm
The age of old railroads saw the birth of the first railroad lines and mass transportation on rail. Read more about old railroads in America.
Why could China's Three Gorges Dam cause an environmental disaster?
science.howstuffworks.com/environmental/green-science/three-gorges-dam-disaster.htm
The Three Gorges Dam could very well lead to an environmental disaster for China. Learn about the Three Gorges Dam.
How Colonialism Works
history.howstuffworks.com/world-history/colonialism.htm
Before World War II, a third of the world's population lived a territory controlled by a colonial power. HowStuffWorks examines colonialism.
How Nuclear Submarines Work
science.howstuffworks.com/nuclear-submarine.htm
Nuclear submarines are powered by nuclear reactors and may carry nuclear weapons. Read about nuclear submarines and how they changed the world's oceans forever.
Early Twentieth Century Railroads
history.howstuffworks.com/american-history/early-twentieth-century-railroads.htm
Early 20th-century railroads saw major improvements in safety and comfort, as well as new regulations. Learn more about railroads in the early 1900s.
Railroads of the 1920s
history.howstuffworks.com/american-history/railroads-of-the-1920s.htm
Railroads of the 1920s reflected a time of uncertainty in the industry at the time. Learn more about the railroads of the 1920s.