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10 Innovations in Water Purification
science.howstuffworks.com/environmental/green-tech/sustainable/10-innovations-water-purification.htm
As far back as 1500 B.C.E., people were trying to purify water to make it drinkable. And we're still at it. Today inventors use tools as simple as clay and as sophisticated as carbon nanotubes to bring clean water to the world.
The Mystery, Myth and Reality of Plum Island
science.howstuffworks.com/life/biology-fields/mystery-myth-reality-plum-island.htm
For years, speculation has surrounded the government's high security animal disease research center, which is slated to close in 2023.
Top 8 Synthetic Fuels
auto.howstuffworks.com/fuel-efficiency/biofuels/8-synthetic-fuels.htm
Different types of synthetic fuels offer some advantages over fossil fuels. Find out about the top synthetic fuels and how they're processed.
What would nuclear winter be like?
science.howstuffworks.com/nuclear-winter.htm
If the sight of a mushroom cloud burning above the horizon suggests that the nuclear weapon-equipped world might end with a bang, then nuclear winter presents the notion that post-World War III humanity might very well die with a whimper.
Why Is My Cat So Clingy All of a Sudden?
animals.howstuffworks.com/pets/why-is-my-cat-so-clingy.htm
While cats are known for being independent creatures, some exhibit clingy behavior that can puzzle (and occasionally overwhelm) even experienced cat parents.
The Worst Air Quality in the World Is in Mountainous Terrain
science.howstuffworks.com/environmental/green-science/worst-air-quality-in-the-world.htm
Air pollution is widely recognized as a major threat to public health, and while air quality data is widely available, the large-scale solutions are often difficult to enact. There are efforts in most developed countries to improve air quality, and pretty much everyone (except the polluters) agrees that it's an urgent problem.
What's the Earth's biggest threat to biodiversity?
science.howstuffworks.com/environmental/conservation/issues/biggest-threat-to-biodiversity.htm
The biggest threat to biodiversity on Earth is explained in this article from HowStuffWorks. Learn about the biggest threat to biodiversity.
The Monarch Butterfly Is More Than an Orange Beauty
animals.howstuffworks.com/insects/monarch-butterfly.htm
The monarch butterfly (Danaus plexippus) is one of the most iconic insects in the natural world.
How Evaporative Emission Control Systems Work
auto.howstuffworks.com/evaporative-emission-control-system.htm
What is evaporative emission control and why does your car need it? Read about evaporative emission control systems at HowStuffWorks.
How the Hüttlin Spherical Engine Works
auto.howstuffworks.com/huttlin-spherical-engine.htm
How does the Hüttlin spherical engine work? Read about the Hüttlin hybrid auto engine at HowStuffWorks.