Presents a blood type puzzle that provides a visual, hands-on mechanism by which students can examine blood group reactions. Offers students an opportunity to construct their own knowledge about blood types. (JRH)

Presents an activity that helps students visualize the major systems of the human body. Involves students building models of those systems, and gives them an understanding of the relationships between different organs by enabling them to see the organs' positions in the body. (JRH)

Describes the construction of electric motors that can be used to teach students the basic principles underlying the direct current motor. (JRH)

Describes an activity that would be useful for any level biology class discussing recombinant DNA technology to help students visualize the step-by-step process involved. (JRH)

Describes a procedure for making slides of microsporogenesis in Tradescantia. Uses photographs to demonstrate that Tradescantia is an ideal organism for studying meiosis in the classroom. Contains 17 references. (JRH)

Describes open-ended experiments with seeds from the common garden radish (Raphanus sativus). The phases of the 5-E learning cycle--Engagement, Exploration, Explanation, Extension, and Evaluation--guide this activity series. (Author/MM)

A low-cost, low-tech colorimeter was constructed from a film canister. The student-constructed colorimeter was used to show the Beer-Lambert relationship between absorbance and concentration and to calculate the value of the molar absorptivity for permanganate at the wavelength emission maximum for an LED. Makes comparisons between this instrument…

Describes an activity designed for secondary school students that explains the global carbon cycle and the production of CO2 through soil respiration. (YDS)

Presents a lesson on volcanoes that evaluates student knowledge and misconceptions and provides factual information. (YDS)

Describes a model demonstrating the difference between mixtures and chemical compounds in which two different colors of clay are used to represent two different elements. Makes connections to real world situations. (YDS)

Presents an activity designed for use during National Chemistry Week 2002 with the theme "Chemistry Keeps Us Clean". Allows students to discover more about a cleaning product they use everyday. Students make their own toothpaste and compare its properties with those of commercial toothpaste. (MM)

Presents laboratory experiments to demonstrate the pH properties of different buffer solutions. (YDS)

Presents a tobacco haploid experiment in which students learn the cytogenetic technique of metaphase analysis of chromosomes and experience the basic principles of haploidy, diploidy, and polyploidy. (YDS)

Presents three science activities on algae targeting middle school and high school students. Uses an interdisciplinary approach and meets the National Science Education Standards. (YDS)

Describes a celestial grid system that gives the coordinates for any object that delineates the sun's ecliptic path--the sun's apparent path through the year. Includes Internet resources. (KHR)