relationship between pendulum length and frequency, discover why some balls bounce higher than others, design a wind-powered vehicle, and observe the effect of color on heat retention. They determine which materials carry the strongest electrical charge, which home appliances use the most electricity, and how the force of wind affects a suspension bridge. While many of the activities in this revised edition are in their original form, some have been updated and rewritten in a new format and others are new.

Popping with Power provides reproducible student worksheets, including data charts, tables, and graphs. A complete lesson plan is included for each of the 24 activities.

Price: Teacher's Guide (ISBN 1881431-51-7), $14.95. Publisher/supplier : AIMS Education Foundation. Materials: Available locally, or from commercial suppliers.

3.83 Pulleys. Enfield, Conn.: LEGO Dacta, 1993.

Grades: 5, 6 This booklet contains information about pulleys, simple pulley activities, and appropriate diagrams and illustrations. It is designed to be used with the LEGO DACTA Pulley Set, which uses the popular LEGO construction blocks. Students first learn the definition of a pulley. Then they arrange pulleys to investigate the direction of rotation of the driver and the follower and to find out how the turning ratio of one pulley to another is determined by the size of the pulleys. Students are challenged to design and build two devices: a conveyor-belt system that uses a belt drive to carry packages, and a boat mover that winches a boat onto the shore.

Each activity in Pulleys states the main idea involved and provides illustrated instructions, additional information, and extension ideas. The guide lists the process and critical thinking skills involved in the activities.

Prices: Teacher's Guide (ISBN 0914831-84-4), $5. Pulley Classroom Pack, $175. Individual Pulley Set, $15. Publisher/supplier: LEGO Dacta. Materials: Available from LEGO Dacta.

3.84 Science Express. An Ontario Science Centre Book. Carol Gold. Toronto, Ontario, Canada: Kids Can Press, 1991.

Grades: 3-6 Science Express contains 36 simple experiments that can be performed at home or in the classroom. Each experiment focuses on one scientific principle or phenomenon. Examples include racing soup cans, making paper from broccoli, testing the effects of sound vibrations on a lit candle, and making an air cannon. Each activity includes a materials list and step-by-step instructions, as well as an explanation of the scientific principle or phenomenon involved.

Price: $8.61 (ISBN 1-55074-017-2). Publisher/supplier: Addison-Wesley. Materials: Available locally.

3.85 Soap Films and Bubbles. AIMS. Ann Wiebe. Fresno, Calif.: AIMS Education Foundation, 1990.

Grades: 4-6+ Students learn about molecules, surface tension, light waves, air pressure, and patterns by experimenting with soap film in Soap Films and Bubbles. In a series of introductory activities, students first explore the effects of wet and dry surfaces on bubbles. They discover that all free-floating bubbles are spherical in shape, and they explore various combinations of bubbles and the structures and patterns they form. Students construct models of water and soap molecules as they investigate surface tension and the chemistry of soap film. In advanced activities, students take a quantitative look at geometric shapes; they discover the mathematical relationship between the size of two equal rings and the distance soap film will stretch between them (catenary curves). They experiment to determine the minimum distances between given numbers of points (Steiner's problem). They find a formula relating the parts of polyhedrons.

Soap Films and Bubbles provides reproducible student worksheets, including data charts, tables, and graphs. A complete lesson plan is included for each of the 21 activities.

Price: Teacher's Guide (ISBN 1881431-25-8), $14.95. Publisher/supplier : AIMS Education Foundation. Materials: Available locally, or from commercial suppliers.

3.86 Sound Science. Etta Kaner. Toronto, Ontario, Canada: Kids Can Press, 1991.

Grades: 3-6+ Lively illustrations, easy-to-follow instructions, and jokes, games, and challenges are among the features of the activity book Sound Science. The book is divided in sections focusing on the human ear, how sound travels, how sound is used, musical instruments, and devices for sending sound over long distances. Examples of activities include making a wailing bowl, playing sound charades, making and playing a one-stringed instrument, and reinventing the phonograph. Experiments use simple, everyday items; many activities could be conducted independently by students.

Each activity in Sound Science features a short introduction, a materials list, step-by-step instructions, a brief explanation, and short items of interest on subjects such as hearing-ear dogs and sound in outer space.

Price: $9.57 (ISBN 1-55074-054-7). Publisher/supplier: Addison-Wesley. Materials: Available locally.

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