Students play and record the “Mary Had a Little Lamb” song using musical instruments and analyze the intensity of the sound using free audio editing and recording software. Then they use hollow Styrofoam half-spheres as acoustic mirrors (devices that reflect and focus sound), determine the radius of curvature of the mirror and calculate its focal length. Students place a microphone at the acoustic mirror focal point, re-record their songs, and compare the sound intensity on plot spectrums generated from their recordings both with and without the acoustic mirrors. A worksheet and KWL chart are provided.

Students learn to use manipulatives and calculators to explore what happens when they change one number at a time in an addition number sentence. They record and develop the pattern that develops.

A career in Actuarial Science in profiled.Includes: Actuarial Science overview, Preparation, Day In The Life, Earnings, Employment, Career Path Forecast, Professional Organizations.

Interactive lesson plan which allows for elementary students to learn the "Part of speech," concepts of adjectives as well as effective characterization techniques. Uses the story of Charlotte's Web.

A profile of aerospace engineering as a career,includes aeronautical and astronautical engineers as sub-categories in this field. Includes Aerospace Engineering Overview - Preparation - Day In The Life - Earnings - Employment - Career Path Forecast - Professional Organizations -Profiles of Aerospace Engineers - Overview PDF - PowerPoint - Podcast.

Find out what sources are contributing to the particulate pollution in your state. An interactive bar graph shows the major types of air pollution and their sources. This particular activity focuses on two types of particulates.

These materials document the goals and activities of the Alabama Christian Movement for Human Rights; from the Birmingham Civil Rights Institute.

Over the years, many immigrants came to Alberta from Estonia. This site profiles the rich history, areas of settlement, sense of communityas well as the Estonian people and their cultural life.

Companion site to the televised documentary "Eyes on the Prize" provides access to a full complement of primary sources on the civil rights movement (1954-85), reflections of the people involved, profiles of important figures, image galleries, and similar resources.

PBS features an excellent two-part film and program on the life and career of our 41st President, George H.W. Bush. Share your views on some of his presidential decisions, browse the family gallery, read a timeline of events in his life, and learn much more about his policies and politics.

This is the accompanying site to the PBS film "Victory in the Pacific." Information provided includes maps by which students can trace the war, eyewitness stories, and discussions by historians.

This investigation uses Cabri Jr. and a cleaver rotation of a triangle to "prove" that the angles in a triangle add up to 180. This could be used to reinforce triangles and paralled lines as well as introduce the concept of rotating an object.

Information from the symposium of the 30th anniversary of the Animal Welfare Act as provided by the U.S. Department of Agriculture.

What happens when the ground under your feet is ice and it's moving? This video segment adapted from NOVA features some of the dangers faced by scientists conducting research in Antarctica.

A detailed biography of Anwar al-Sadat. Site contains photographs and links to further information.

Read the minute-by-minute flight plan of Apollo 11. Links to other information about Apollo 11.

This is an introduction to finding the arc length and area of sectors of circles. Students should have the formulas for Circumference and Area of circles.

Students determine the area and perimeter of regular polygons and use that information to conduct a beginning investigation of limits.

Use Cabri Jr. to find the area of several regular polygons and then use that investigation to derive the area of a circle from a many-sided polygon.