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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 •…

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…

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…

U.S. Pop Music Timeline

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

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 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…

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…

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…