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How did 168 conquistadors take down the Incan empire?
history.howstuffworks.com/history-vs-myth/conquistador-incan-empire.htm
The Incan empire was erased from existence by fewer than 200 men, but how was this possible? Find out how the Incan empire was brought down.
In Vitro Fertilization Overview
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/fertility/in-vitro-fertilization.htm
In vitro fertilization is the most common type of assisted reproductive technology. Learn more about how the vitro fertilization process works.
How Central Vacuum Systems Work
home.howstuffworks.com/central-vacuum.htm
When the floor needs a good cleaning, most of us reach for the portable vacuum cleaner and drag it around the house. Well, what if your whole house were a vacuum? Find out how central vacuum systems work.
Understanding Postpartum Depression
Postpartum depression is a very real and often very frightening occurrence that affects about half of new mothers. Learn about postpartum depression.
How Carbon Footprints Work
science.howstuffworks.com/environmental/green-science/carbon-footprint.htm
While actual footprints measure size, weight and speed, carbon footprints measure how much carbon dioxide (CO2) we produce in our daily lives. Do you know how big your carbon footprint is?
How Dual-clutch Transmissions Work
auto.howstuffworks.com/dual-clutch-transmission.htm
Dual-clutch transmissions offer the best of manual and automatic transmissions and are becoming increasingly popular. Learn about dual-clutch transmissions.
Infertility
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/fertility/infertility-ga.htm
Infertility is defined as a couple's failure to conceive a child after one year of regular sexual intercourse without birth control.
How Jet Lag Works
science.howstuffworks.com/life/inside-the-mind/human-brain/jet-lag.htm
Jet lag can be a drain on any long-distance trip. Learn about what causes jet lag and the best ways to prevent and deal with jet lag at Discovery Health.
Psoriasis Overview
health.howstuffworks.com/skin-care/problems/medical/psoriasis.htm
Psoriasis can be a painful skin problem. Learn more about how psoriasis works at HowStuffWorks.
How to Treat Sunburn
health.howstuffworks.com/skin-care/beauty/sun-care/how-to-treat-sunburn.htm
Want to know how to treat sunburn? Visit HowStuffWorks to learn how to treat sunburn.