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What happens to abandoned mines?

science.howstuffworks.com/engineering/structural/abandoned-mine.htm

Abandoned mine shafts may look romantic with their clapboarded entrances and rusting pickaxes, but they can be deadly. So who ensures that these dangerous sites are properly closed up? You may find the answer a little unsettling.

What Are Mines?

science.howstuffworks.com/engineering/structural/underground-mining.htm

Underground mining has come a long way from the days of men with pickaxes and canaries. It relies much more heavily on machinery that makes it much safer than in the past. Which techniques are used in mining today?

How Sales Leads Work

money.howstuffworks.com/business-communications/how-sales-leads-work.htm

Generating sales leads is the first step in becoming a successful salesperson. Learn all about lead generating sales leads at HowStuffWorks.

Ancient Folks Didn't Have Twitter, but Boy Did They Have Curse Tablets

people.howstuffworks.com/culture-traditions/cultural-traditions/curse-tablets.htm

Ancient Greeks and Romans used thin strips of lead to vent their frustrations or write messages to the gods.

How Landmines Work

science.howstuffworks.com/landmine.htm

Landmines have killed or maimed over 1-million people since 1975. Find out how landmines work and what countries are doing to prevent landmine tragedies.

How Gold Works

science.howstuffworks.com/gold.htm

We love it. We wear it glittering around our necks and sparkling at our ears, wrists and feet. We pass it down to our children and hoard it in secret stashes. Why is this precious metal so prized?

Cadmium: The Highly Toxic Metal That Powers the World

science.howstuffworks.com/cadmium.htm

Cadmium is a natural metal and the leading component in rechargeable batteries and solar cells. It is also highly toxic and heavily regulated.

28 Industrial Revolution Inventions That Shaped Our World

science.howstuffworks.com/innovation/inventions/5-industrial-revolution-inventions.htm

Many inventions during the Industrial Revolution caused Europeans and Americans to move from an agricultural economy to an industrial one and changed the world forever. What were the top 10?

How Salt Works

science.howstuffworks.com/innovation/edible-innovations/salt.htm

Not only do we need to consume salt, we also need it for a variety of nonfood uses. But if it's so important, why do health organizations recommend that we closely watch our intake? Apparently, there can be too much of a good thing. Learn what happens when we overload on salt or get too little of it.

Are Frogs on the Brink of Extinction?

animals.howstuffworks.com/endangered-species/frog-extinction.htm

Frogs are like the canary in the coal mine for the state of the environment. HowstuffWorks looks at their endangered status.

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