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Can you use toothpaste and mouthwash with fluoride?
health.howstuffworks.com/wellness/oral-care/products/toothpaste-and-mouthwash-with-fluoride.htm
Should you double up and use toothpaste and mouthwash with fluoride? Are there any dangers? Learn about using toothpaste and mouthwash with fluoride.
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.
The Coldest State in the U.S. Is Below Freezing on Average
science.howstuffworks.com/nature/climate-weather/coldest-state-in-the-us.htm
The United States has a wide range of climate zones, from the subtropical to the arctic. On the low end of the thermometer, there are plenty of options for a deep winter chill. Here, we look at a couple different ways to determine the coldest state in the U.S. — and by both definitions, there's one winner.
8 Most Densely Populated Cities in the World
history.howstuffworks.com/world-history/most-densely-populated-city.htm
Statistically, over half of the people reading this article live in a city, with a higher population density than rural or suburban areas. For instance, New York City has nearly 27,000 people crammed into each square mile (2.6 square km) of land.
The Coldest Country in the World Is Below Freezing, on Average
science.howstuffworks.com/nature/climate-weather/atmospheric/coldest-country-in-the-world.htm
Over our long history, humans have managed to thrive in a wide range of climates, from the very hot to the very cold. The modern world is different in many ways from the ancient, but we still live pretty much all over, in places that are sweltering and places that are absolutely frigid.
15 Largest Cities in India, Ranked by Population
people.howstuffworks.com/largest-cities-in-india.htm
India, a land of incredible diversity and culture, is home to some of the most populous cities in the world. Each of the largest cities in India features its own blend of history, tradition and modernity, showcasing the country's rich heritage and rapid development. From bustling metropolises to historic centers, India's urban landscapes reflect its vibrant spirit.
15 Largest Cities in Africa, Ranked by Population
people.howstuffworks.com/largest-cities-in-africa.htm
Africa, a continent of immense diversity, history and rapid urbanization, is home to some of the fastest-growing cities in the world. Its largest urban centers are economic and cultural powerhouses, showcasing a blend of traditional heritage and modern development. The largest cities in Africa reflect the continent's vibrancy and its pivotal role on the global stage.
What We Do — and Don't — Know About the Pentagon's Secret UFO Program
Does the U.S. government have proof there is life from other worlds visiting Earth?
Do People Really Lose Body Parts by Sticking Them Out of a Car Window?
Is sticking your hand out of the window of a moving car really dangerous? Learn more about traumatic injuries in this HowStuffWorks article.
What 'An Inconvenient Truth' Got Right (And Wrong) About Climate Change
Now that its sequel is out, where did Al Gore's landmark environmental documentary hit the mark? What did it get wrong?