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Article Comparison

One of the hallmarks of the "World Book difference" is the clear, understandable writing in World Book products. Articles on the sciences provide many good examples. For instance, compare the article on inflation theory from Wikipedia with the article from World Book:

*Source: National Assessment of Educational Progress (NAEP) 2007


First paragraph of the article from Wikipedia:

In physical cosmology, cosmic inflation cosmological inflation or just inflation is the theorized exponential expansion of the universe at the end of the grand unification epoch, 10-36 seconds after the Big Bang, driven by a negative pressure vacuum energy density. The term "inflation" is also used to refer to the hypothesis that inflation occurred, to the theory of inflation, or to the inflationary epoch.

"Inflation (cosmology)." Wikipedia. 2009. Web. 2 July 2009.



First paragraph of the article from World Book:

Inflation theory, in physics, holds that the early universe experienced an extremely brief period of particularly rapid expansion. It serves as an important addition to the big bang theory—the idea that the current expansion of the universe began about 14 billion years ago in a cosmic explosion called the big bang. Inflation theory addresses key questions in cosmology, the study of the universe's structure and development.

Dodelson, Scott. "Inflation theory." World Book Student. 2009. Web. 2 July 2009.

For other examples of World Book's easy-reading science articles, compare the following articles with those in competing encyclopedias:

Cosmic microwave background (CMB) radiation
Gravitational wave

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