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Which Planets Are Considered 'Earth-like' and Why?
science.howstuffworks.com/other-earth.htm
Exoplanets are planets that orbit stars other than our sun. Read about exoplanets and find out how scientists are searching for exoplanets with life.
Has Earth reached its carrying capacity?
science.howstuffworks.com/environmental/green-science/earth-carrying-capacity.htm
Carrying capacity is the idea that sustainability requires balance. Learn about carrying capacity and human population.
Are personal watercraft destroying the planet?
science.howstuffworks.com/environmental/green-science/watercraft-destroy-planet.htm
Personal watercraft destroying the environment is a cause for major concern. Learn about personal watercraft destroying the environment.
Top 5 Innovations in Oil Drilling
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Oil drilling has been around for more than a century. But because of the numerous developments in the technology, it has grown leaps and bounds in that time.
Alkali Metals: Elements in the First Column of the Periodic Table
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Although the term might be unfamiliar, you know all about alkali metals. Ever used salt or eaten a banana? So, what special properties do these elements have?
Rainbow Colors Always Appear in the Same Order
science.howstuffworks.com/rainbow-colors.htm
"Why are there so many songs about rainbows?" sings Kermit the Frog in a song (about rainbows) called "Rainbow Connection" from 1979's "The Muppet Movie." And it's not just songs that feature rainbows. Children's memorabilia (from "My Little Pony" to Lisa Frank to anything with unicorns) and sweet treats ( from Lucky Charms to sherbert) are all filled with these dazzling rainbow colors.
Skipping Stones on Ice Makes Crazy Sci-fi Sounds
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You know that sound synonymous with a certain laser blaster from a galaxy far, far away? Yeah. It sounds like that.
How the Mars Rovers Work
science.howstuffworks.com/mars-rover.htm
Of course we want to go to Mars. Until we figure it out though, roving robots with names like Spirit, Opportunity, Sojourner and Curiosity are our best bet for digging up dirt on our nearest planetary neighbor. Want to go along for the ride?
How Cement Mixers Work
science.howstuffworks.com/transport/engines-equipment/cement-mixer.htm
Few are unfamiliar with the mixer trucks that transport concrete from the factory to the construction site. How do they keep that stuff from hardening while they move?
Image Gallery: Inside a Nuclear Power Plant
science.howstuffworks.com/inside-nuclear-power-plant-pictures.htm
Are you wondering how nuclear power plants work? Tour the inside of a nuclear power plant with these pictures to learn more about this technology.