Rader's CHEM4KIDS.COM
Chem4Kids.com is a free website that teaches the basics of chemistry to all ages. It has sections on atoms, matter, elements, the periodic table, biochemistry, and reactions. This is our first site that has been around since 1997.
- Visit Chem4Kids.com

Rader's BIOLOGY4KIDS.COM
Biology4Kids.com is a free website that teaches the basics of biology to all ages. We have sections on cell structure, cell function, the scientific method, classification, microorganisms, invertebrates, plants, vertebrates, and animal systems.
- Visit Biology4Kids.com

Rader's GEOGRAPHY4KIDS.COM
Geography4Kids.com is a free website that teaches the basics of geography and earth sciences to all ages. It has sections on earth energy, earth structure, the atmosphere, the hydrosphere, the biosphere, climates, and BGC cycles (biogeochemical).
- Visit Geography4Kids.com

Rader's COSMOS4KIDS.COM
Cosmos4Kids.com is a free website that teaches the basics of astronomy and space exploration to all ages. It has sections on the universe, galaxies, systems, the Solar System, space exploration, and missions.
- Visit Cosmos4Kids.com

Rader's PHYSICS4KIDS.COM
Physics4Kids.com is a free website that teaches the basics of physics to all ages. It has sections on motion, light, thermodynamics, sound, waves, electricity, magnetism, and modern physics.
- Visit Physics4Kids.com

Rader's NUMBERNUT.COM
NumberNut.com is a free website that teaches the basics of math to all ages. It has sections on artithmetic which includes addition, subtraction, multiplication, and division. There are now more advanced ideas like fractions, decimals, and percentages that have been added. Our next update will have information on prealgebra topics.
- Visit NumberNut.com