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How did ancient civilizations use sundials to tell time?
electronics.howstuffworks.com/gadgets/clocks-watches/ancient-civilizations-use-sundials.htm
Ancient sundials first popped up in Egypt around 1500 B.C. Learn how these sundials came about and what they were used for all those centuries ago.
What causes the sound of a heartbeat?
health.howstuffworks.com/human-body/systems/circulatory/sound-of-heartbeat.htm
We're all familiar with the sound of a heartbeat: lub-dub, lub-dub. Learn what causes the sound of a heartbeat and why yours might sound different.
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 Bluetooth Surveillance Works
electronics.howstuffworks.com/bluetooth-surveillance.htm
Bluetooth surveillance uses the popular wireless technology found in mobile devices to track people's movements. Learn about Bluetooth surveillance.
How Ballpoint Pens Work
home.howstuffworks.com/pen.htm
Before the handy ballpoint, getting a few sentences onto paper was a pretty involved task. Find out how the ballpoint pen stores and manages its own ink supply to make writing a snap.
Can an MRI machine also act as a lie detector?
people.howstuffworks.com/mri-lie-detector.htm
A MRI lie detector could detect truthfullness more accurately than a polygraph machine. Learn about MRI lie detectors and and MRI lie detection.
How Web Comics Work
entertainment.howstuffworks.com/arts/comic-books/web-comic.htm
Web comics are different from comic books because they are not limited in size. Learn more about Web comics and other features of some popular Web comics.
How long would it take for your house to fall completely apart?
home.howstuffworks.com/home-improvement/repair/house-entropy.htm
Would your house fall apart if you left it standing without any maintenance over time? Find out how long it would take for your house to fall apart.
How the Freecycle Network Works
money.howstuffworks.com/freecycle-network.htm
Find out how the Freecycle Network got started, how the process works and how you can start giving your unwanted stuff away to people who'll use it.
Traditional Chinese Herbal Medicine
health.howstuffworks.com/wellness/natural-medicine/chinese/traditional-chinese-herbal-medicine.htm
In China, more than a million tons of herbs are used each year as medical substances. Learn about traditional Chinese herbal medicine.