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The Most Dangerous Insect (and 13 Others to Avoid)

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When you think of the most dangerous creatures on Earth, you might picture big animals like sharks or lions, but the insect world is filled with tiny critters capable of causing serious harm. The most dangerous insect can kill by spreading deadly diseases, and others achieve the same end with toxic venom.

Are air fresheners bad for your health?

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Air freshener dangers? How could something that's simply supposed to freshen the scent in the air be dangerous. Learn about air freshener dangers.

8 Most Dangerous Jellyfish and 1 Stinging Imposter

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While swarm of jellies may look serene, you're best off keeping your distance. A sting from the most dangerous jellyfish on Earth can be deadly. Even when we're not looking at the most dangerous, many jellyfish species have venomous stings that can cause everything from mild discomfort to serious pain.

What Was the Most Dangerous Dinosaur in Prehistory?

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Dinosaurs ruled the Earth millions of years ago, and while many were peaceful herbivores, others were some of the most dangerous animals to ever walk the planet.

The World's Most Dangerous Bird and 9 Runners-up

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The most dangerous bird species are also some of the most beautiful. These seemingly innocent creatures can pack a punch — or peck — that you definitely want to avoid.

Dangerous Hypermiling Techniques

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Is saving a few drops of gas worth endangering the lives of everyone else on the road? Learn about dangerous hypermiling techniques at HowStuffWorks.

13 Most Dangerous Fish, Eels and Sharks

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Fish may seem harmless compared to larger predators on land, but some of the deadliest animals are hiding in the oceans and rivers throughout the world. From venomous stings to sharp teeth, the most dangerous fish species can be lethal to humans.

The World's Most Dangerous Cat and 14 Other Fierce Felines

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What's the difference between a purring feline on your lap and the most dangerous cat in the world? Whether large or small, the skilled hunters on this list capable of taking down prey — and sometimes they come into contact with humans, resulting in fatal or serious injuries.

The 12 Most Aggressive Sharks

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Dangerous sharks may not hunt humans, but if they took a sample bite, they could do some serious damage. Which 10 sharks make up the worst in the ocean?

Is hydrogen fuel dangerous?

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Hydrogen fuel is an attractive alternative fuel source. Learn about hydrogen fuel and the dangers of the element, including the Hindenburg disaster story.

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