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DK Science: Atmosphere

AURORASLAYERS OF THE ATMOSPHEREOZONE LAYERFIND OUT MOREPRESSURE SYSTEMSThe Earth would be as lifeless as the Moon without the atmosphere – a blanket of gases surrounding the planet and…

Comics Timeline

The history of the funnies in America by Shmuel Ross and Jennie Wood 1800s • 1900–1919 • 1920s • 1930s • 1940s • 1950s • 1960s • 1970s • 1980s • 1990s • 2000s •…

U.S. Pop Music Timeline

c. 1775 British soldiers sing "Yankee Doodle" to mock colonists; Americans adopt it as their own tune. 1815…

DK Science: Composites

NATURAL COMPOSITESMART CARFIND OUT MOREA composite is a combination of two or more different materials. The new material combines the best properties, such as strength and lightness, of each of…

Why make dollar coins?

The Question: Why does the US keep introducing dollar coins even though nobody seems to use them? The Answer: It does seem pointless at first…

The Quarter Gets Changed

A new quarter for every state by Damon Goldsmith Delaware's quarter, the first to be released, features a portrait of patriot Caesar Rodney.Photo Credit: U.S. Mint…

The Golden Gate Bridge

Golden Gate Facts & FiguresTotal vehicle crossings since opening: 1,540,506,019 (as of 12/31/97)Vehicle Crossings in 1997: 41,367,000Vehicle Toll in May 23, 1937: 50 cents each wayVehicle…

The Value of 1943 Pennies

The Question: I have heard that 1943 steel pennies are worth a lot of money. I just happen to have one. Any idea how much it's worth? The Answer: It's true that…

Highest Inflation (in 2023)

Money to Burn Inflation is a pretty natural process in an economy where the value of currency decreases over time as the supply of money increases. Inflation is part of the reason why milk used to…