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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 a theory of exponential expansion of space in the early universe. The inflationary epoch lasted from 10^–36 seconds after the conjectured Big Bang singularity to sometime between 10^–33 and 10^–32 seconds after the singularity. Following the inflationary period, the Universe continues to expand, but at a less rapid rate.

"Inflation (cosmology)" Wikipedia, 2018, https://en.wikipedia.org/wiki/Inflation_(cosmology). Accessed 6 Apr. 2018.

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 13.8 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, World Book, 2018, www.worldbookonline.com/student/article?id=ar749366. Accessed 6 Apr. 2018.

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
Topology
Time