Access to the Web means finding millions of resources. How does anyone choose what to review and even more, what to use? Most often, finding a trusted source that provides thoughtful recommendations makes all the difference. In this case, the sites listed are from the federal government.

In 1997, more than 30 Federal agencies formed a working group to make hundreds of federally supported teaching and learning resources easier to find. The result of that work is the Federal Resources for Educational Excellence web site (FREE). (http://www.ed.gov/free/index.html). The web sites listed below are excerpted with permission.

Here are web sites for teaching science.

Exploring the Moon
     is a teacher's guide for learning about lunar geology,
     distance to the moon, Apollo landing sites, and life support
     systems.  Lessons focus on calculating the distance between
     scale models of earth and the moon, designing a spacecraft for
     travel to and from the moon, the geology of the six Apollo
     landing sites, and calculating the diameter of the moon using
     proportions.  (National Aeronautics and Space Administration)

Global Warming Debate
     discusses global warming, policy struggles to address it,
     international efforts, the cap-and-trade system, and more.
     Interactive features show how much CO2 different cars produce
     and how populations around the world may have to adapt to
     climate changes in 100 years.  (NewsHour, National Science
     Foundation)

Mars Exploration Rovers
     tells the story of Spirit and Opportunity, two rovers that are
     investigating the hills and craters of Mars.  See an animation
     of Spirit's journey from launch pad to Mars.  Learn about its
     instruments.  See a slide show of the most detailed images of
     Mars' surface ever captured.  A lesson on the distance and
     relative size of other planets is included.  (NewsHour,
     National Science Foundation)

Search for Ancestors
     looks at the history of the double helix, the science behind
     DNA test kits for people who want to learn more about their
     ancestry, an interactive map of human migration over 200,000
     years, DNA analysis tracing African-American lineage, and how
     mutations found in DNA can unlock the past.  (Online NewsHour,
     National Science Foundation)

Biodiversity Counts
     helps teachers get middle school students out into their own
     backyards to gather and identify plants and arthropods
     (spiders, insects, and more).  Lesson plans, essays, and
     interactives focus on dozens of topics: how to capture
     arthropods, mount dried plants, make a net, keep a field
     journal, set up guest quarters for visiting arthropods,
     establish rules for field trips, and find local specialists.
     (American Museum of Natural History, National Aeronautics and
     Space Administration)

Biodiversity: It Takes All Kinds to Make a World
     invites elementary students to explore biodiversity in a city
     park, on an island, and in a desert.  Learn about 10 species
     whose habitats are in danger, a conservation project in
     Africa, and where in the world various foods we eat come from.
     (American Museum of Natural History, National Aeronautics and
     Space Administration)

Bioed Online
     features lessons on the water cycle and global warming, the X
     chromosome, sleep and daily rhythms, muscles and bones, and
     food and fitness.  Experts offer presentations (streaming
     videos) on classification, cloning, viruses, infectious
     diseases, animal behavior, Mendelian genetics, genomes, sleep
     and performance, body systems, childhood obesity, asthma,
     ecosystems, populations, nutrition and energy, and more.
     Articles discuss biology news -- stem cells, bird flu, and
     more.  (Baylor College of Medicine, Multiple Agencies)

DNA Microarray
     is a "virtual lab" of a DNA microarray experiment.  Compare
     samples of healthy tissue and cancerous tissue as a scientist
     would.  Learn the basics about DNA and gene expression.
     (Genetic Science Learning Center, National Institutes of
     Health)

Memory
     dissects a sheep brain to show us "the anatomy of memory." See
     works of an artist who paints entirely from memory.  (Compare
     his paintings to photos of places.)  Play interactive games
     that test your memory -- learn ways to improve it.  Discover
     why some things are easier to remember than others (droodles
     game).  Which facial features help us remember a face?  Which
     image of the penny is correct?  Try a mnemonic device called
     "elaborative encoding."  (Multiple Agencies)

Science of Healthy Behaviors
     introduces middle school students to the scientific study of
     behavior.  Lessons focus on defining "behavior," what
     influences it, surveys, and behavioral specialists in health
     care settings.  In role-playing activities as behavioral
     therapists, students investigate the influences and
     consequences of behaviors.  They also learn how science
     provides evidence that can be used to understand and treat
     human disease.  (National Institutes of Health)

Science of Mental Illness
     provides six lessons that help students understand what mental
     illnesses are.  PET images show changes in the brain and how
     treatment can change activity levels and restore functioning.
     Case studies and other activities explore differences among
     illnesses, risk factors, and treatment plan goals.  Students
     develop a brochure to inform people about mental illness.
     (National Institutes of Health)

USGS Publications
     offers 40 online booklets on geology-related topics: acid
     rain, birth of mountains, building stones of our nation's
     capital, changing continents, collecting rocks, deserts,
     earth's interior, earthquakes, fossils, gemstones, geologic
     history of Cape Cod, geologic time, glaciers, gold, the Ice
     Age, San Andreas fault, and volcanoes.  (U.S. Geological
     Survey)