Choose from 20 unit studies available for purchase through the HLN E-Bay Store! Once purchased, unit studies are sent via email in PDF format.



Butterflies - $3.95
Butterflies and moths are members of the same order of insects, Lepidoptera. Together they make up the second largest order of insects. There are many different families of butterflies and moths.

Bugs Everywhere! - $2.95
Are insects driving you buggy? Scientists say that, at any given time, about 10 quintillion insects inhabit Earth. Why not take some time, as summer days -- and swarms of insects descend upon us -- to introduce your children to these tiny animals, and to the effects, both good and bad, that they have on the other 5 percent of Earth's creatures?

Estuaries - $3.95
The ecosystems of estuaries, the places where rivers meet oceans, are some of the most biologically productive natural environments in the world. They provide habitat, nutrients and protection for a wide variety of marine and land organisms. Many are being threatened by pollution and human development.

Rivers - $3.95
The strength of the River has shaped our land. The waters carry stones from high in the source to the mouth at the sea, provided avenues for transport from distant coast to villages inland, and support the many industries and towns that develop along them. By learning about the rivers of the world you will appreciate all we can do to keep them clean and beautiful.

The Human Body - $3.95
Move with us from the microscopic to the macroscopic scale in our investigation of the human body. We start out at the cellular level and move our way up in scale through tissues to organs and systems. Round out the lessons with a look at keeping the whole body healthy!

Celebrate the Heart - $3.95
How does the heart work? How can we keep our hearts healthy and strong? Join HLN for a series of lesson plans that looks at the mechanics of the heart and how to strengthen this vital organ!

Insects and Arachnids - $2.95
Do you know why spiders are called arachnids? Have you ever wondered why they don't get caught in their own webs? Have you ever seen a blue ladybug? Insects and spiders are some of the most fascinating animals on earth, and not all those fascinating creatures live in far-away lands. In fact, many of these creepy, crawly creatures can be found in your own backyard! Isn't it time you got to know those neighbors better?

Birds - $3.95
Many people believe that birds can be identified by their ability to fly, but that's not true. Although all birds have wings, not all birds can fly -- and not all animals that can fly are birds. The real distinguishing characteristics of birds are feathers. That's right! All birds have feathers -- and birds are the only animals that have feathers!

Forests - $3.95
Forests are necessary to the health of our planet. They provide clean water for drinking; habitat for plants and animals; wood for paper, packaging, and building; recreational opportunities, and cultural and spiritual benefits. Forest biomes contain medicines and thousands of species. Forests have been revered and respected for years, yet they have also been abused and destroyed.

The Rainforest - $3.95
Let us take you on an adventure to explore the rainforests of the world. In this unit you will identify the regions that contain rainforests and discover the unique environmental conditions that characterize rainforests. The lessons are designed to teach topics/skills in geography, environmental science, cultural studies, and the arts, using the rainforest as an overall theme.

Deserts of the World - $3.95
Scientists estimate that about one-fifth of the earth's land surface is desert. Deserts can be found on every continent except Europe. Deserts are suspended in harsh extremes of heat and aridity, making them one of the most fragile ecosystems on the planet! Explore the desert biome as we trek through the deserts of the world and discover what life is like there!

At the Beach - $3.95
The seashore is a great place to play and learn about science! Did you know that there many kinds of beaches? Did you know that some beaches are better than others for collecting shells? Did you know that some beaches are black or green? Grab your pails and shovels as HLN heads to the beach for some fun!

Reptiles and Amphibians - $3.95
Did you know that a reptile's scales are dry - and as hard as human fingernails? Or that reptiles live on land and breathe through lungs? Did you know that the smallest reptile in the world is less than an inch long -- and the largest is more than 30 feet long? Reptiles have lived on earth for more than 300 million years, and they are probably the most misunderstood - and the most fascinating - creatures alive today! What don't you know about reptiles?

Mammals - $3.95
Mammals are found everywhere in North America. They live on land and -- like the lowly mole -- under the land. Bats are mammals that fly through the air; whales are mammals that swim under the sea. Mammals live in deserts and forests and grasslands. They live in ponds and rivers and oceans. They live on mountains and treetops. They even live in your own house and in your own backyard! Don't you want to know more about them?

Spring Into Gardening - $3.95
Did you know that gardening has been around for almost 11,000 years? The Egyptians were the first to make paper from papyrus, and the oldest surviving garden plans for a garden in Thebes date back to 1495 BC! Gardening goes back to the beginnings of civilization!

All About Plants - $3.95
Come with us and explore the fascinating world of plants, the producers and providers of energy to the world's host of living organisms - humans and animals alike!

Amphibians! - $3.95
Compared to other vertebrates, amphibians tend to be overlooked. Why? Perhaps it is because they are not "warm and fuzzy" like mammals. Or could it be that they don't evoke the fear, fascination and respect that reptiles inspire? They most certainly lack the sporting appeal of fish. Many more people prefer watching birds to amphibians.

Water - $3.95
Water is a richly complex substance that is vital to our physical existence. Without water, life as we know it would not exist! Scientists can help us understand why water is so essential to life, but they do not fully comprehend its chemical and physical properties, nor can they explain where it came from, or why it exists.

Save Your Vision - $3.95
Vision is an important but sometimes misunderstood sense. The complex signals that form the images we see can be difficult to understand, but fascinating and fun to learn about!

Photosynthesis - $3.95
The phenomenon of photosynthesis has intrigued scientists since it was first recognized. The plant process of capturing the energy from sunlight to convert water and carbon dioxide into sugar has been known about for well over a century. After all that time and despite countless hours of research, it is still not completely understood! Come join HLN to explore what we DO know about photosynthesis!