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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.
Oral Hygiene 101
health.howstuffworks.com/wellness/oral-care/products/oral-hygiene.htm
Proper oral hygiene can help keep your teeth strong and prevent some painful dental problems. Learn about how to care for your teeth.
Knee Replacement Overview
health.howstuffworks.com/medicine/surgeries-procedures/knee-replacement.htm
Getting a knee replacement is often a last resort for those whose knees are destroyed by arthritis or wear and tear. Learn about knee replacements.
12 Real Haunted Houses That'll Give You Nightmares
science.howstuffworks.com/science-vs-myth/afterlife/5-real-haunted-houses.htm
Real-life haunted houses make us hide under the covers and sleep with one eye open. Learn about the spooky history of these real-life haunted houses.
How Casinos Work
entertainment.howstuffworks.com/casino.htm
Casinos bring in billions of dollars in revenue each year. Learn about casinos and find out how security keeps casinos safe and fair.
10 Hardest Things to Teach a Robot
science.howstuffworks.com/10-hardest-things-to-teach-robot.htm
If we're ever going to live in a world in which machines behave like people, we humans have some teaching to do. But as this writing robot attests, we're not as far away as you might think.
10 Best Things to Build in to Your Home
home.howstuffworks.com/home-improvement/construction/planning/10-best-things-build-in-home.htm
These days, homeowners have add-on options that previous generations could only dream of. From integrated electronics to secret rooms, we'll scope out 10 of the best.
How Special Relativity Works
science.howstuffworks.com/science-vs-myth/everyday-myths/relativity.htm
Special relativity deals in phenomena that don't agree with our historical or commonsense views of how the universe works. In fact, many of the theory's assertions almost appear ludicrous.
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.
10 Eccentric Homes With Hidden Passageways
home.howstuffworks.com/eccentric-home-passageway.htm
Eccentric homes with hidden passageways aren't confined to detective novels. Learn about these five eccentric homes and what makes them so weird.