Presents four activities that involve chemical reactions with vinegar, lemon juice, or orange juice. These activities can be used to teach about acid-base reactions and acids as chemical catalysts. (WRM)

Features a three-part activity designed to teach students about coastal upwelling, the upward movement of cooler, more nutrient-rich water along a coast. Activity includes a mapping exercise, a graphing exercise, and questions for analyzing the map and graph. (Author/WRM)

Presents an activity in which students propose that apples change their color as they ripen. Students gain content knowledge about decomposition, the growth of living mold, and the life cycle of fruit flies through purposeful inquiry connected to previous knowledge. (ASK)

Presents an activity that enables students to change time into distance to see the "length" of the age of the Earth. (WRM)

Presents four examples of students engaged in self-directed building projects. Uses the enactivist ideas of enaction, coemergence, mutual specification, and adequate conduct to describe and interpret the four cases. Describes the ways in which personally significant meanings and personal competency emerge within the context of self-directed…

Presents a laboratory activity designed to be a botanical autotutorial tour of a supermarket, meant to increase students' appreciation of the role that botany plays in the production of food. (WRM)

Explores the new proving of Ceva and Menelaus's results from Archimedes's Law of the Lever. Presents the geometrical construction of the weighted centroid of the gravity of finite particles along with some properties of vector representation, and sets up a related result to spatial shape. (Author/ASK)

Describes a simple exercise that can be used to demonstrate the concepts of SI units, experimental design, and significant digits in a manner that holds the attention of students who already understand these concepts but is still valuable for students who are less prepared. (CCM)

Describes how inanimate objects exert an opposing force. Provides three examples that help to convince students that inanimate objects such as tables can indeed push back. (CCM)

Describes an activity with cars and fans that observes the motion of cars under force. Lists required materials, the procedure, and introductory questions for the activity. (YDS)

Presents a unit on designing and building a bridge. (YDS)

Describes Herschel's demonstration of interference arising from many coherent rays. Presents a method for students to reproduce this demonstration and obtain beautiful multiple-beam interference patterns. (CCM)

Presents a simple extension of the standard demonstration of the Meissner Effect which shows the superconductor to be a perfect conductor. (CCM)

Describes an activity that centers around advertisements for alternative medical therapy devises based on magnets. (CCM)

Finds that computer simulations can be used to visualize the processes involved with lunar tides. Technology adds value, thus opening new paths for a more distinct analysis and increased learning results. (Author/CCM)