Provides directions for creating four different optical illusions. (FL)

Presents some activities for studying trees. (SJL)

Describes an activity that involves determining local solar time of the various parts of a total lunar eclipse--beginning of the dark umbral phase of eclipse, onset of totality, end of totality, and end of dark umbral phase of eclipse--and comparing to the solar time of the events at Greenwich to calculate the longitude at the place of…

Presents a laboratory exercise on photosynthesis suitable for high school biology. Allows students to perform the experiments with easily obtainable materials and within a lengthened period. Includes photosynthesis lab prep notes for teachers. (JRH)

Describes how to make a string radio for a lesson on sound and string telephones. (NB)

Explains how to use the equation for frequency of vibration of a transversely oscillating bar or pipe with both ends free to vibrate to build a simple and inexpensive xylophone from a 3-meter section of copper pipe. The instrument produces a full major scale and can be used to investigate various musical intervals. (Author/NB)

Describes an investigation involving flies. Students observe the growth of ordinary flies from the larval stage to adulthood and create poems, stories, and pictures. Concludes that not only did students learn the usual science content of an insect unit, they also began to view commonplace things in a new way. (NB)

Explains the difference between traditional and inquiry-based chemistry experiments. Modifies a traditional cookbook laboratory for determining molar volume of gas to include inquiry. Also discusses methods for assessment. (Author/NB)

Describes Archimedes principle and why a ship sinks when it gets a hole in it. Suggests an activity for teaching the concept of density and water displacement through the construction of a simple submarine. Includes materials and procedures for this activity. (KHR)

Describes three methods used in the calculation of height in a high school curriculum package for rocketry. Discusses some assumptions in the approaches. (JRH)