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How to Use the Unit Circle in Trigonometry

science.howstuffworks.com/math-concepts/unit-circle.htm

A unit circle is an important part of trigonometry and can define right angle relationships known as sine, cosine and tangent.

How was the Bay Bridge built?

science.howstuffworks.com/engineering/structural/bay-bridge-built.htm

The Bay Bridge is a wonder of structural engineering. Find out how multiple architectural styles were incorporated into the bridge that unites Oakland with San Francisco.

How was the construction of the World Trade Center unique?

science.howstuffworks.com/engineering/structural/world-trade-center-construction-unique.htm

The World Trade Center employed several new approaches to skyscraper construction. From slurry walls to sky lobbies to "tube within a tube" design features, what made this project distinctive from an architectural engineering standpoint?

How will landing on Mars work?

science.howstuffworks.com/landing-on-mars.htm

Landing on Mars will be one of the most dangerous and rewarding space missions. Learn how landing on Mars will further our understanding of space.

How will population growth affect energy?

science.howstuffworks.com/environmental/energy/population-growth-affect-energy.htm

The world is growing at an amazing rate. Currently, the Earth's population is growing by 60,000 people every eight hours -- that's two children born every second somewhere around the globe.

How would time travel affect life as we know it?

science.howstuffworks.com/science-vs-myth/time-travel-affect-life.htm

Would time travel affect life in any significant way if it was at all possible? Find out if time travel would affect life in this article.

Hubble Captures New Images of Jupiter's Northern Lights

science.howstuffworks.com/hubble-aurora-images-jupiter.htm

Hubble captures new images of Jupiter's aurora. Learn more about these aurora images in this HowStuffWorks Now article.

Hubble Hubble: Telescope Provides Stunning New Images of Two Planetary Nebulas

science.howstuffworks.com/hubblenew-images-planetary-nebulas.htm

Astronomers used Hubble's full range of imaging to dissect wild 'fireworks' happening in two nearby young planetary nebulas.

Human Penis Bone Disappeared With Rise of Monogamy, Succinct Sex

science.howstuffworks.com/environmental/earth/archaeology/human-penis-bone-baculum-monogamy.htm

Most mammals have a penis bone called a baculum, but humans don't. A new study sheds light on the history of the baculum, and why ours is missing.

Hunting for Martians in the Most Extreme Desert on Earth

science.howstuffworks.com/hunting-for-martians-in-most-extreme-desert-on-earth.htm

Life-hunting rovers are going to Mars in 2020. HowStuffWorks tracks their adventures on Earth and wonders what the Martian life will be named, if found.

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