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The Smallest Animal in the World Weighs Less Than 1 Milligram
animals.howstuffworks.com/animal-facts/smallest-animal-in-the-world.htm
The natural world is home to some incredibly tiny creatures. From miniature mammals to tiny amphibians, many of the smallest animals in the world weigh less than a grape and are smaller than an average 5-year-old's hand.
What Is the Strongest Military in the World?
science.howstuffworks.com/strongest-military-in-the-world.htm
Military power isn't distributed evenly across the globe. Some countries have huge armies, air forces and navies, while others have little more than some semi-professional militias.
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 Crab in the World, Plus 8 Enormous Contenders
animals.howstuffworks.com/marine-life/biggest-crab-in-the-world.htm
Known for their long legs, pincers and hard shells, most crustaceans are omnivorous scavengers, although some are predators or vegetarians. Either way, a steady diet can assist certain crab species in growing to incredible sizes.
What Is the Oldest Country in the World? Depends on Your Criteria
history.howstuffworks.com/world-history/oldest-countries-in-the-world.htm
With constantly changing borders and governments, identifying the oldest countries in the world is tricky work.
Buildup to World War II: January 1931-August 1939
history.howstuffworks.com/world-war-ii/buildup-to-world-war-2.htm
This World War II timeline highlights important dates during January 1931 to August 1939. Follow the events of World War II and the German invasion.
The Most Dangerous Volcano in the World (and 9 Scary Others)
science.howstuffworks.com/nature/natural-disasters/most-dangerous-volcano-in-the-world.htm
Volcanoes are some of Earth’s most awe-inspiring features — but also among its deadliest. When asking which is the most dangerous volcano in the world, scientists consider not just eruption history but also population density, eruption style and potential global effects.
What Are the 7 Largest Countries in the World by Area?
science.howstuffworks.com/environmental/earth/geophysics/largest-countries-in-world-by-area.htm
The seven largest countries in the world account for nearly half of the world's land area, but one is far larger than the rest. Do you know what the largest country is?
The 9 Longest Rivers in the World: From the Nile to the Congo
science.howstuffworks.com/environmental/earth/geophysics/9-longest-rivers-in-world.htm
When it comes to rivers, longest doesn't necessarily mean biggest, and length can be difficult to determine, so the top spot will always be debated.
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.