Archaeology includes the study of the biologic and cultural evolution of man, the development of civilizations, and the study of time periods both through the study of written words and archaeological finds. Just like in other fields of study, archaeology has its own special fields. An archaeologist may be a specialist in ecology, physical anthropology, geology, and dimatology.

In this unit you will look at amazing images of the northern lights and find out the science behind their appearance. Plan an imaginary (or real) trip to spot the aurora borealis and experience the magic and wonder captured by folktales of the past.

Join HLN today, as we become a catalyst to help you understand chemistry that is all around us!

Nothing is more crucial to the survival of any living organism than the health of the environment it lives in. Nothing is more important to the health of Earth's diverse environments than the activities of the humans who inhabit it. Celebrate Earth Day 2003 by introducing your children to Earth's wonders, to the dangers that threaten them, and to the human actions that can protect them.

Earthquakes are frightening events that have terrible aftereffects for mankind. How do earthquakes happen? What have been the major earthquakes in history, and how can we protect ourselves from them? Learn more in this thematic unit on earthquakes.

Did you know that going to the movies is a great way to experience an optical illusion first hand! When we go to the movies, our brains tell us that there is movement occurring on the screen in front of us. There certainly is movement going on, although in actuality it is the movement of many frames of still shots being projected onto the screen in rapid succession, creating the optical illusion of fluid movement in front of us! What else can we learn about optical illusions? Join us in this fascinating unit study.

National Kite Month is celebrated in April with kite activities all around the country. Come learn more about the many surprising uses of kites in historical and modern times!

What is the science of weather all about? Discover the answer to that question and much more in this unit!

Orbiting the Earth from an average distance of 384,403 miles, the moon plays an important role in how the Earth is shaped. Learn more about how Earth's only satellite affects our planet today in this cross-curricular journey to the moon!

Learn the terminology and skills used by today's scientists while focusing on one of Earth's most pressing environmental problems-Ozone in our environment.

Rocks are composed of one or more minerals necessary to sustain life as we know it. Rocks also act as an impenetrable skin, shielding us from the molten hot magma that resides inside the earth. Come with us to explore the exciting world of rocks and minerals!

Are you puzzled by the fact that snow is white? Have you ever been curious as to why snow scrunches when you walk on it? What makes snowflakes stay together? If you have pondered these questions and are ready to quench your appetite with a snow-related menu, then this is the unit for you!

When you look at the sky on a clear day, you see the Sun, shining light and giving off heat. When you look at the sky on a clear night, you see the Moon, stars and maybe some planets. Learn about our solar system in this unit with lessons that will take you across the curriculum -- and out of this world!

Summertime is the perfect time of year for stargazing, whether you do it the back yard, sitting on a mountaintop, or lying in a sleeping bag on a camping trip. The summer sky has many easy to recognize constellations and planets that even beginners can find without difficulty.

What are some of nature's deadliest weather conditions? What makes them so dangerous? Find out in this unit about extreme weather.

The Sun is the closest star to Earth and is the main supply of energy for sustaining life on this planet. Research on our closest star allows scientists to learn more about how solar system began, about Earth's own atmosphere, and about other stars outside of our solar system.

What is the intertidal zone? What kind of animals and plants live in the regions we call tidepools? How have these organisms adapted to the environment they live in? Join HLN as we peer into tidepools and explore the life found in these rocky ocean zones!

Don't get blown over and twisted up! Learn about the facts and dangers of tornadoes.

Volcanoes are powerful forces of nature! Molten rock from inside the earth makes its way to the surface to relieve the pressure and shifts happening below the earth's surface. Learn more about the basics of where volcanoes come from in this unit for all ages!

Who has seen the wind? Neither I nor you; but when the leaves hang trembling, the wind is passing through. -- Christina Rossetti. Here's a whirlwind of activities and lessons related to wind and wind power to explore!

Can You Imagine being the first person to discover what a fossil was? Just imagine the excitement you would feel holding the fossil of a dinosaur egg in your hand! But dinosaurs are not the only fossils from prehistoric times. There are fossils from plants, birds, animals, and insects! Come join HLN and learn more about fossils!

Mars is the fourth planet from the sun in our solar system. If you were to visit Mars you would find a landscape of geographical features much like Earth's own canyons, volcanoes, polar icecaps, and riverbeds. Learn more!

It is estimated that every person in the U.S. creates over 4 pounds of garbage each day. As the human population increases, the dangers to our environment multiply. Learn more about recycling and what you can do to help our world.

Learn about the best math and science Web sites for learning, lessons and activities in this special edition two-part unit.

We know them as spring, summer, autumn and winter. Why are the seasons so important? Find out in this unit!

The winter solstice is more than just an astronomical event that happens once a year. In ancient times it was cause for huge celebrations and festivals, and many of today's holiday traditions can be traced to those times. Come learn about the solstice and what it means today.

The winter solstice is more than just an astronomical event that happens once a year. In ancient times it was cause for huge celebrations and festivals, and many of today's holiday traditions can be traced to those times. Come learn about the solstice and what it means today.

The steam engine was one of the most important inventions of the Industrial Revolution. It laid the foundation for changes in the way people lived, worked, and moved, and it changed the way agricultural products were grown and produced. Join HLN to learn more!

The clickety-clack of the rails and the distant wail of a train whistle in the still night air recalls a romantic and nostalgic period in the history of America. During the more than 100 years when trains were the fastest way to travel from place to place in the United States, Americans fell in love with railroads and the locomotive. Learn about the early inventors of transportation development, and the use of steam and rails in moving freight as well as people.

What are filled with air, come in various shapes, sizes and colors and float high in the sky? Balloons! Soar to new heights as you explore balloons, zeppelins and dirigibles in this across-the-grades unit!

Energy comes in many different forms including heat (thermal energy), light (radiant energy), mechanical, electrical, chemical, and nuclear energy. In this thematic unit, you will find out what kinds of energy sources you use and review some ways to conserve!