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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.
How Dark Matter Works
science.howstuffworks.com/dictionary/astronomy-terms/dark-matter.htm
For decades, stargazing scientists have been facing their own darkness on the edge of town as they try to explain one of astronomy's greatest mysteries: dark matter. Have they been successful, or will the universe carry its secrets for a long time?
Where do butterflies get their striking colors?
animals.howstuffworks.com/insects/butterfly-colors.htm
Butterfly color is some of the most striking in nature. Learn how butterfly wings use ordinary color and structural color.
Railroads During World War II
history.howstuffworks.com/american-history/world-war-ii-railroads.htm
Railroads during World War II were placed under more strict government control to aid in the war effort. Read about railroad industry of World War II.
How did dinosaurs leave tracks in solid stone?
science.howstuffworks.com/environmental/earth/geology/stone-dinosaur-track.htm
How did dinosaurs leave tracks in solid stone? They walked in soil that became sedimentary rock. Learn how did dinosaurs leave tracks in solid stone?
Are married people happier than singles?
science.howstuffworks.com/life/inside-the-mind/emotions/married-people-happier-than-singles.htm
Are married people happier than singles? Take a look at our research into whether not married people are happier at HowStuffWorks.
Alternative Medicines for Alcoholism & Drug Addiction
Alternative medicines for alcoholism and drug addiction include nutritional, herbal, and acupuncture therapies. Learn more about these treatments.
Why do cougars scream?
animals.howstuffworks.com/mammals/cougar-scream.htm
Cougars scream during mating season to attract the opposite sex. Learn how cougars scream and why humans don't hear these cougar screams too often.
How Drawbar Pull Works
auto.howstuffworks.com/auto-parts/towing/equipment/tow-bars/drawbar-pull.htm
Drawbar pull is an important factor to consider when doing serious towing. Learn all about drawbar pull at HowStuffWorks.
How do scientists know what's inside dinosaur eggs?
science.howstuffworks.com/environmental/earth/geology/inside-dinosaur-egg.htm
How do scientists know what's inside dinosaur eggs? Learn about the techniques used by scientists to examine the fossilized remains of dinosaur embryos.