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Rev Up: The Diesel Engine Quiz
play.howstuffworks.com/quiz/diesel-quiz
While diesel earned itself a bad reputation for spewing soot in the early days, improvements have made it much cleaner. Test your knowledge of all things diesel with this quiz.
How HEMI Engines Work
auto.howstuffworks.com/hemi.htm
A HEMI engine is a popular high-performance engine type. Learn about the history of the HEMI engine and see what sets a HEMI apart from other engine types.
What makes your knuckles pop?
health.howstuffworks.com/human-body/systems/musculoskeletal/question437.htm
What makes your knuckles pop, and is it really bad for you?
How Diabetes Affects the Heart
health.howstuffworks.com/diseases-conditions/diabetes/how-diabetes-affects-the-heart.htm
Diabetes has a direct effect on heart health. Learn how diabetes can cause or exacerbate many of the aspects of heart disease.
How Blood Works
health.howstuffworks.com/human-body/systems/circulatory/blood.htm
Blood is the most commonly tested part of the body, and it is truly the river of life. Learn about red and white blood cells, lymphocytes, blood tests, blood types and blood donation.
How Human Migration Works
science.howstuffworks.com/life/evolution/human-migration.htm
Human migration is the idea that humans developed in Africa and then spread to Europe and Asia. Learn about human migration and how human migration works.
Turbo Vs Supercharger: Comparing Car Engine Boosters
auto.howstuffworks.com/question122.htm
Forced induction systems compress the air that flows into an engine, which creates more horsepower. Learn about the types of forced induction systems.
How Nitrous Oxide in Cars Works
auto.howstuffworks.com/question259.htm
I'm always hearing people talk about pumping nitrous oxide into an engine. How does nitrous oxide help an engine perform better?
How is oxygen made aboard a spacecraft?
science.howstuffworks.com/oxygen-made-aboard-spacecraft.htm
Oxygen made aboard a spacecraft is done through the use of oxygen generators. Learn about oxygen made aboard a spacecraft.
Would Psychic Powers Really Cause a Nosebleed?
If mental strain caused a bloody nose, academic testing sites would be awash in crimson. So why do we still see psychic nosebleeds from "Stranger Things" to "Scanners"?