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How tall can a tree grow?
science.howstuffworks.com/life/botany/tree-grow.htm
Can a tree grow and grow? Or can a tree grow only to the point that water transport limits it? Learn more about tree growth and the tallest trees.
How Carbon Negative Cement Works
home.howstuffworks.com/home-improvement/construction/materials/carbon-negative-cement.htm
Carbon negative cement could be the solution to the carbon dioxide emissions caused by the production of cement. Learn about carbon negative cement.
True or False: Trucks Edition
play.howstuffworks.com/quiz/true-or-false-trucks-edition
Trucks are a popular type of vehicle that are used to store and transport a variety of cargo. Think you know everything there is to know about these high-powered vehicles? Try this quiz now to see if you can score a 100%!
Top 10 Eco-friendly Substitutes for Plastic
science.howstuffworks.com/environmental/green-tech/sustainable/5-plastic-substitutes.htm
10 eco-friendly substitutes for plastic is discussed in this article from HowStuffWorks. Learn about 10 eco-friendly substitutes for plastic.
What's the Largest Land Animal That Ever Existed on Earth?
animals.howstuffworks.com/animal-facts/largest-land-animal-all-time.htm
Just how big do animals come? Dive backward through time and the fossil record in search of the most colossal member of kingdom Animalia.
There's a Rhino-shaped Cave in Washington State
science.howstuffworks.com/environmental/earth/geology/rhino-shaped-cave.htm
It's perhaps one of the strangest fossils ever discovered. We'll explain how it came to be 15 million years ago, and how hikers found it in the '30s.
How Road Trains Work
auto.howstuffworks.com/road-trains.htm
Australian road trains are the true bad boys of the Outback. Learn more about Australian road trains (aka truck trains) at HowStuffWorks.
5 Farming Technologies That Changed the World
science.howstuffworks.com/environmental/green-science/5-farming-technologies-changed-world.htm
Farming technologies have allowed the world to be fed, even though most people no longer farm. Only 2 percent of Americans are farmers, versus 90 percent in the 1700s. Which tools and technologies have had the most impact on farming and why?
The Biggest Animal in the World and 7 Massive Contenders
animals.howstuffworks.com/animal-facts/question687.htm
What is the biggest animal ever to exist on Earth? The largest animal that is currently living on the planet is the blue whale, but was it the largest animal to have ever existed in history? Find out the answer in this article.
How Energy-efficient Electronics Work
electronics.howstuffworks.com/everyday-tech/energy-efficient-electronics.htm
Energy-efficient electronics can help you save money by using less electricity. Learn more about different types of energy-efficient electronics.