Information about the element, Plutonium, atomic number 94. Covers physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations. Discusses reactor- and weapons-grade plutonium, and...

Information about the element, Aluminum, atomic number 13. Covers physical and atomic properties, how abundant it is on the Earth, and permissible exposure limits. Also discusses the origin of its name, sources of aluminum, and uses for...

A collection of articles on ancient climatology. They examine past extremes of the Earth's climate, cycles of climate change, and cataclysmic climate-changing events that are believed to have occurred.

Explains the features of animals defined as vertebrates, how they evolved, and their taxonomy. (Published: April 29, 2010)

Article discussing the structure, function, and efficiency of stomata, the apertures on plants' leaves that regulate gas and water vapor exchange during photosynthesis. (Published: August 3, 2010)

Article covering the Silurian Period, which lasted from 443 million to 417 million years ago. It covers the subdivisions of this Period, some life forms preserved in the fossil record, geology, and climate. (Published: January 22, 2010)

The process of respiration in plants, humans, and animals is discussed, along with diseases that can affect respiration. (Published: November 16, 2011)

Scientific article detailing what pollination is, types of pollination, animals (mainly insects) that facilitate pollination, ways pollination can take place, its evolution, pollination in agriculture, and threats to pollination....

Article explaining what photovoltaic cells are, their role in solar energy, how they work, how electricity is produced, and applications of this technology. (Published: April 24, 2010)

Article explaining what the phosphorus cycle is, where it occurs, its place in the biotic world, and the environmental impact of human activities on the phosphorus cycle. (Published: October 8, 2009)

Explains what petrochemicals are, the main hydrocarbon feedstocks that form the basis of petrochemical industries, sources, uses, and products made from petrochemicals. (Published: September 25, 2011)

Information about the element, Oxygen, atomic number 8. Covers history, physical and atomic properties, abundance, and permissible exposure limits. Also discusses forms of oxygen, isotopes, sources, and uses.

Detailed information about oak trees: their taxonomy, evolution, habitats, morphology, significant oak forests around the world, and a list of species that are endangered. (Published: December 22, 2010)

Article explaining what methane is, its impact as a greenhouse gas on global warming, and natural and man-made sources of methane. (Published: April 30, 2010)

A biography of the scientist Marie Curie (1867-1934). With links to additional information.

Article explaining the basic characteristics of mammals, their diet, reproduction, behavior, conservation concerns, taxonomy, and their evolution. (Published: September 23, 2010)

Information about the long-finned pilot whale, a member of the dolphin family. Covers physical features, lifespan, reproduction, behavior, diet, distribution, habitat, its conservation status, and efforts being taken to protect it....

Article describing the different categories of lichens, their physical features, how they reproduce, their evolution, and important benefits lichens provide to humans. (Published: July 19, 2010)

Article explaining what ice shelves are, some different types, how they interact with one other, why they are important, what causes an ice shelf to collapse, and some examples of ice shelves in the Arctic and Antarctic. (Published:...

Article explaining what a gymnosperm is, and its origin in the Carboniferous Period. It covers taxonomy, distribution, and types of gymnosperms and how they reproduce. (Published: March 24, 2010)

Explains the origin of the Fahrenheit temperature scale.

Article describing some of the extreme environments where extremophile organisms can live, and giving examples from bacteria, archaea, flora, and fauna. (Published: November 26, 2010)

Article on the Etosha Pan saline desert in Namibia, which is what remains of a lake from the Pliocene Epoch. Describes its geography, climate, plants and animals, its conservation status, and threats to its biodiversity. (Published:...

Discuses how different types of coal-fired power plants work, and their advantages and disadvantages.