Presents a modification of the classic Blue Bottle demonstration that involves the alkaline glucose reduction of methylene blue. Uses other indicators in the classic Blue Bottle to produce a rainbow of colors. (JRH)

Analyzes 50 major textbooks in the fields of evolution, biology, ecology, genetics, paleontology, and systematics, focusing on how the conceptual framework of evolution as a process is presented and developed in those fields. Lists definitions of evolution provided in the textbooks and discusses the implications of the findings. Contains 56…

Describes a research assignment for 8th grade students on the elements of the periodic table. Students use web-based resources and a chemistry handbook to gather information, construct concept maps, and present the findings to the full class using the mode of their choice: a humorous story, a slideshow or gameboard, a brochure, a song, or skit.…

A year-long study was conducted in three high school physics classes to provide empirical support for the existence of levels of language-rich teaching. Three levels of language-rich teaching were investigated: (1) low level by hands-on; (2) medium level by small groups; and (3) high level by active mental processing (AMP) journal keeping.…

Describes the necking of polymer sheets that occurs when they are stretched. Discusses the effect and the mechanisms of necking. Lists four references. (YP)

Summarizes research to find the nature of deep earthquakes occurring hundreds of kilometers down in the earth's mantle. Describes further research problems in this area. Presents several illustrations and four references. (YP)

Explains the color change of the sky by using scattering with science history. Provides several diagrams in each case, such as daylight, twilight, just after sunset, setting sun, and earth's shadow. Presents a reference of three further reading materials. (YP)

This paper aims to do two main things: first, to provide an introduction to ecophilosophy by presenting a spectrum of positions that have been developed to characterize the relationship between humans and their environment; second, to examine the variety of ways in which scientific work impacts upon human thought in regard to each of these…

Discusses the reasoning behind the determination of the distance from Earth to the Moon by the Greek philosopher Aristarchus upon observing a lunar eclipse. Presents calculations for estimating Earth's distance from the Moon using simple observations made during a solar eclipse. (JRH)

Examines the following research questions and others: (1) How do students define the mole concept? and (2) Is there a connection between student's definition of the mole concept and their explanations of the numerical identity between the atomic or molecular mass and molar mass of a substance? Results are discussed in terms of research in chemical…

Describes the construction of and the theory behind a balloon made of newspaper that is used in Brazilian folk parties. (JRH)

Discusses the origins of electronegativity as a qualitative concept in the period between 1809 and 1813. Outlines the contributions of Amedeo Avogadro and Jons Jakob Berzelius to the development of this concept. Contains 53 references. (JRH)

Presents a demonstration that uses a laptop computer as a source of polarized light to make clear the principle behind a liquid-crystal display (LCD). (JRH)

Provides a history on the origin of the radian and other units of angular measure including the mil and the grade or grad. (MVL)

Describes GNVQ, which is about learning science in a series of scenarios modeled closely on real problems and authentic practical procedures drawn from the wide range of sectors where scientifically qualified people are employed. (MKR)