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Who Invented Zero?The concept of zero, both as a placeholder and as a symbol for nothing, is a relatively recent development.
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Marco Polo: Facts, Biography & TravelsThe travels of Marco Polo from Venice to Asia opened up a whole new world to Europeans.
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What is Metformin?Metformin is a prescription drug used primarily in the treatment of type II diabetes.
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What is Diclofenac (Voltaren)?Diclofenac is often used to treat pain, tenderness, swelling and stillness resulting from various types of arthritis.
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Atorvastatin (Generic Lipitor): Uses, Dosage & Side EffectsAtorvastatin is a prescription medicine used to treat high cholesterol. It is sold under the brand name Lipitor.
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Clindamycin: Uses & Side EffectsClindamycin is a prescription antibiotic commonly used to treat acne, vaginal infections and certain bacterial infections.
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Amelia Earhart: Biography & DisappearanceAmelia Earhart's disappearance during an attempt to fly around the world remains a mystery, but recent expeditions may have found clues to her fate.
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Cavities (Tooth Decay): Causes, Symptoms & TreatmentCavities, also referred to tooth decay or caries, are holes in the teeth. Cavities are the second-most common health disorder in the United States.
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Broccoli: Health Benefits, Risks & Nutrition FactsBroccoli, the green vegetable both reviled and revered by U.S. presidents, is a nutrient powerhouse.
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Anne Frank: History & LegacyAnne Frank was a teenage girl whose diary about her family's experiences while hiding from the Nazis continues to inspire and educate.
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Giant Sequoias and Redwoods: The Largest and Tallest TreesGiant sequoias and redwood trees grow hundreds of feet tall. They are found primarily in California.
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Hindenburg Crash: The End of Airship TravelThe German zeppelin Hindenburg exploded 80 years ago, bringing an abrupt end to the age of airship travel.
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Caspian Sea: Largest Inland Body of WaterThe Caspian Sea is the Earth’s largest inland body of water. But is it a sea or a lake? The definition has international implications.
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Lake Baikal: World's Largest, Deepest LakeLake Baikal, in southern Siberia, is the largest freshwater lake in the world by volume and the world's deepest lake.
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Facts About Great Salt LakeGreat Salt Lake is the largest lake west of the Mississippi River and the largest salt lake in the Western Hemisphere.
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Crater Lake: Deepest Lake in U.S.Crater Lake in Oregon, known for its vibrant blue color and purity, is the deepest lake in the United States.
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Scopes Monkey Trial: Science on the StandThe 1925 case against the teaching of evolution had a long-lasting effect on Americans' perception of science.
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Piltdown Man: Infamous Fake FossilThe Piltdown Man, claimed to be a "missing link," was one of the most successful and consequential hoaxes in scientific history.
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The Feejee Mermaid: Early Barnum HoaxThe Feejee Mermaid was one of P.T. Barnum's earliest successes in showmanship, promotion and humbug.
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Perpetual Motion Machines: Working Against Physical LawsFor centuries, people have been trying to invent perpetual motion machines. The laws of physics, though, are working against them.
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Cardiff Giant: 'America's Biggest Hoax'The Cardiff Giant, sometimes referred to as “America’s Biggest Hoax,” is a 10-foot-long stone figure that was touted as a petrified giant.
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Plague: A Scourge From Ancient to Modern TimesPlague is often associated with the Middle Ages, but the infamous disease wreaked havoc before and after that time, and continues to infect people today.
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What Are Free Radicals?Free radicals are molecules with unpaired electrons. They rob other cells of electrons, causing damage and contributing to many diseases.
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Grapefruit: Health Benefits & Nutrition FactsGrapefruit is a popular citrus fruit that is a terrific source of vitamins, fiber and other nutrients.
