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Cloaca: The Single Opening in Animals, Plus Human Implications
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A cloaca is a single bodily opening in many animals for excretion and reproduction. In rare human cases, failure to separate during development leads to complications.
Can You Pass This Difficult Cursive Letters Test?
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As we've become reliant on typing, cursive is becoming a lost art. Whether you're a Pinterest-famous cursive writer extraordinaire or you can't remember the last time you hand wrote something, take this quiz to see how many cursive letters you know.
How Lewis and Clark Worked
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Lewis and Clark are famous for exploring the Louisiana Purchase. Learn about the exploration of Lewis and Clark and their Corps of Discovery.
How the U.S. Navy Works
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The U.S. Navy is the biggest in the world. It is divided into operating forces and shore establishment.
All 'Aboot' Canadian Holidays
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What's Victoria Day all about? Why is Canadian Thanksgiving in October? We'll give you a quick tour of Canadian holidays.
How the CIA Works
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Despite plenty of Hollywood films about the CIA and its spies, many people still don't know what the agency actually does. Take a look at the history of the CIA.
How Tattoos Work
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Tattoos decorate the body with ink injected into the skin. Learn about creating tattoos, from sterilizing tattoo equipment to finding a tattoo parlor.
How Mexican Wrestling Works
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Mexican wrestling puts a new twist on American pro wrestling. Learn about Mexican wrestling characteristics, Mexican wrestling history and famous luchadores.
How Labor Unions Work
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Labor unions lobby for better working conditions, hours, pay and benefits. Learn about labor unions and the role they play in securing workers' rights.
9 Most Successful Fast-Food Chains
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The fast food industry has grown at an astronomical rate over the last 30 years. Learn about the 9 most successful fast-food chains.