Manipula math with Java : the sum of outer angles of a polygon
This interactive applet allows users to see a visual demonstration of how the sum of exterior angles of a polygon sums to 360 degrees. Students can draw a polygon and have the applet show the exterior angles. Then users decrease the scale of the image, gradually shrinking the polygon down almost to a point, while the display of the exterior angles remains and shows how the angles merge together to cover the whole 360 degrees surrounding the minuscule polygon. Copyright 2005 Ohio State University
Author(s): IES, Inc

Manufacturing
The manufacture of products requires massive amounts of energy. This informational piece, part of a series about the future of energy, introduces students to the energy needs of the manufacturing community. Students explore three ways that manufacturing uses energy and the importance of fossil fuels to the manufacturing sector. A replacement for fossil fuels is suggested. An article on manufacturing soft drink cans is accessible from a sidebar. A link to a PBS NewsHour article on communities tha
Author(s): Iowa Public Television. Explore More Project

How do you light up your bike without reflectors or lamps?
Bicycle safety is a critical matter. This riddle asks students how they can illuminate their bicycles without using reflectors or headlamps. Before they select their answer, students are given a clue. They read about and watch a video clip of two children's attempts to use glow-in-the-dark materials to light up their bikes. The riddle's final page presents students with three clickable answer choices. Brief feedback is given for the incorrect choices. When students select the best answer, a shor
Author(s): Twin Cities Public Television

This easy to read page includes a biography of Chadwick who discovered the neutron, a photo of Chadwick and links to related people such as Rutherford.
Author(s): Creator not set

Astronomy
This page contains links to one pagers on historical instruments of astronomy with photos of the following : Astronomy Slides, Celestial Globe, Cometarium, Globe, Gregorian Telescope, Kepler's Laws Demonstration, Orrery, Planetarium, Planisphere, Stereoscopic Pictures of the Moon, Tellurian, and Transit.
Author(s): Creator not set

Antarctic Climate and Data Graphs
This page provides a comparison and overview of the average monthly temperature for four representative stations in Antarctica and three centers (London, Sydney, and New York) of population on different continents.
Author(s): Paul Ward

Nucleic Acids : DNA and RNA
This lesson is an introduction to the structure and function of DNA including the process of DNA replication. A short multiple-choice quiz is included.
Author(s): Anthony Carpi

Ice Worms and Their Habitats on North Cascade Glaciers
This article describes ice worms (Mesenchytraeus solifugus) that live on glaciers in southern Alaska, the Coastal range and British Columbia, and in the Olympics and North Cascades as far south as Mt. St. Helens. Pictures of the ice worms and information on their habitat, physiolology, diet, and behavior are provided.
Author(s): Mauri S. Pelto

Meteor crater map
A Landsat image of the world with crater locations flagged. One can zoom in on any location.
Author(s): Creator not set

Galileo's biography
This biography is based on information from the Galileo Project. It contains pages entitled Early Life, Galileo and the Pendulum, Galileo On Motion, Galileo's Mechanical Devices, Galileo's Family Life, Galileo's Telescope, Galileo and the Inquisition,and Text-Only Version
Author(s): Megan Wilde

Biology4Kids
This appealing site by Kapili.com has lots of information and neat photos, this is a great site to learn about how to study and classify life forms, ranging from cells and microbes to plants and animals. Visitors can be guided through the site tour, browse, or search for specific topics. The site is interesting and informative.
Author(s): Creator not set

Water Tower
This website describes how water towers work. It includes colorful photographs of water towers and a diagram of how water travels through them.
Author(s): Marshall Brain

Matter: Atoms from Democritus to Dalton
This web page provides an overview of atomic theory from Democritus to Dalton and reviews John Dalton's 4 basic theories on matter. The page is also available in Spanish.
Author(s): Creator not set

Dragonfly Museum
The digital dragonfly on-line museum offers a large collection of dragonfly images. It includes a discussion of dragonflies and photographs of a wide variety of dragonflies arranged by family and of the emergence sequence.
Author(s): Creator not set

Evolution : Online Lessons for Students: Learning Evolution
These seven online lessons provide multimedia pathways to help students understand evolution and the nature of science. Each lesson focuses on an essential question and contains two to three engaging activities. The website includes both student lessons and teacher pages for each topic.
Author(s): Creator not set

Tropical Twisters - Hurricanes : How They Work and What They Do
This NASA site contains a wealth of information about hurricanes, including how they are created, how they move, and the dangers they pose. Also included are sections that deal with naming of hurricanes, hurricane hunters, a VR trip through a hurricane, satellite instrumentation, and a video of hurricane Andrew.
Author(s): Creator not set

Seeds of the world : Journey to Forever
Seeds of the world: Journey to Forever - No seeds, no food, vanishing seeds, most crop varieties already lost, rendezvous with extinction, seed saving, biodiversity, world hunger This site discusses the importance of seeds to humans and the global economy. It provides extension information about genetically modified seeds and the Green Revolution.