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Trig Identities: A Crash Course in Complex Math Concepts
science.howstuffworks.com/math-concepts/trig-identities.htm
Fundamental trigonometric identities, aka trig identities or trigo identities, are equations involving trigonometric functions that hold true for any value you substitute into their variables.
How the Jeep Hurricane Works
auto.howstuffworks.com/jeep-hurricane.htm
The Jeep Hurricane is an extreme off-road concept vehicle. Learn about the Jeep Hurricane's dual engine design and find out how the Jeep Hurricane performs off-road.
Pregnancy Tests Overview
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/how-pregnancy-tests-work.htm
Home pregnancy tests are an easy way to find out if you are pregnant, though only your doctor can tell you for sure. Read how pregnancy tests work.
Can We Manufacture Water Out of Thin Air?
science.howstuffworks.com/environmental/earth/geophysics/manufacture-water.htm
The manufacturing of water is a concept that will help the development of places with water shortages. Learn about the concept of water manufacturing.
Grassoline: Can we fuel cars with grass?
auto.howstuffworks.com/fuel-efficiency/alternative-fuels/grassoline.htm
Grassoline for fuel is a concept that is under development in the ongoing search for an alternative to oil. Learn about the concept of grassoline.
How Reincarnation Works
people.howstuffworks.com/reincarnation.htm
Reincarnation is the concept that the soul, or some aspect of the soul, is reborn into new lives. Learn about the concept of reincarnation in Eastern religion.
How the Aptera Hybrid Works
auto.howstuffworks.com/aptera-hybrid.htm
The Aptera Hybrid is a concept vehicle that aims to achieve 330 miles per gallon. Learn more about the amazing Aptera Hybrid concept vehicle.
Jeep Celebrates the Gladiator at Easter Jeep Safari
auto.howstuffworks.com/jeep-gladiator.htm
Jeep unveils six concept trucks based on its new Jeep Gladiator. HowStuffWorks looks at both the Gladiator and the concept cars it spawned.
Taoism and Chi
people.howstuffworks.com/taoism-and-chi.htm
Chi is an important component of Taoism. Learn more about chi as a Taoist concept and see how chi manifests itself in human experience.
8 Signs of Pregnancy
health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/eight-signs-of-pregnancy.htm
These eight signs of pregnancy can help you determine whether you've conceived. Learn the eight signs of pregnancy at Discovery Health.