The 19th century saw a rapid technological change, together with paradigm shifts in scientific understanding. These articles research how authors responded to the new possibilities afforded by technology and science.

The HMS Beagle, carrying Charles Darwin, sailed for five years and circumnavigated the world. Darwin recorded his observations in journals and later published them in 1839. This site contains pictures related to this expedition.

Using diagrams and descriptive illustrations, this college-level biology reference book discusses the development of evolutionary theory.

A great essay that illustrates how science is done as well as the relationship between dinosaurs and modern birds. Includes a picture to illustrate this concept, and contains many links to related sites.

Wikipedia offers a site on the topic of sexual selection, including an image and a description of one of the most famous types of sexual selection.

Read about the life and work Ernst Mayr, one of 20th century's leading evolutionary biologists.

Charles Darwin called the brain of the ant "one of the most marvelous atoms of matter in the world." Anna Stockl takes us inside the tiny but mighty insect brain. [4:22]

[Free Registration/Login Required] Students engage in the concept of natural selection and further their understanding of diversity and relatedness within the living world. Inquiries into evolution explain the ways in which natural...

An English naturalist who established that all species of life have descended over time from common ancestry. He proposed the theory of natural selection and evolution.

A biography of Thomas Henry Huxley, a contemporary of Charles Darwin, and a strong supporter of his theory of evolution.

What is evolution? What is natural selection? How has our understanding of evolution changed since Darwin's day? You will find the answers to these questions and more in this basic explanation of the evolutionary process.

This video segment from Evolution: "Darwin's Dangerous Idea" shows biologists Chris Schneider and Tom Smith studying hummingbirds and other animals in Ecuador. Their research is investigating the processes by which new species are formed.

[Free Registration/Login may be required to access all resource tools.] Why connect biology and geography? This module will provide resources for students to understand continental drift theory, human population and its distribution, and...

Scientific article explaining what natural selection is, and how it manifests itself through genetics and from generation to generation. Natural selection is compared to genetic drift, both of which cause evolution to occur. The limits...

In this text excerpted from Chapter 3, "Struggle for Existence," of Charles Darwin's "On the Origin of Species," Darwin draws on firsthand and historical information for his observations about evolution.

Explore isolated volcanic islands. Charles Darwin's observations and collections of the Galapagos wildlife in 1835 contributed to his theory of evolution by natural selection. [7:08]

In this interview filmed for Evolution: "Darwin's Dangerous Idea," biologist Chris Schneider discusses the relationship between conservation and speciation.

NPR presents a timeline on the events surrounding the Scopes Monkey Trial. Includes photos, recollections and information on the people involved in the trial.

The American Geological Institute has done a great job defining and explaining evolution in this online booklet. Darwin, fossils, natural selection, and change over time are some of the concepts that are covered. Make sure to see the...

The American Geological Institute has done a great job defining and explaining evolution in this online booklet. Darwin, fossils, natural selection, and change over time are some of the concepts that are covered. Make sure to see the...

(1890-1882) Naturalist known for his theories of Evolution and Natural selection

This survey of early dinosaur discoveries in North America discusses the first dinosaur specimens and the scientific debate that they inspired.

This is a black and white photo of Charles Darwin, a legendary scientist famous for his work on evolution and natural selection. Check out our Charles Darwin facts page for more information.

The Scopes Trial, also known as the Scopes Monkey Trial, was the 1925 prosecution of science teacher John Scopes for teaching evolution in a Tennessee public school, which a recent bill had made illegal. The trial featured two of the...