Increasingly, marine researchers are finding that there are far more jellies and jellyfish in the world's oceans than previously believed. Indeed, these creatures may play an unexpectedly large role in ocean ecosystems. This science bulletin, which features spectacular underwater footage, follows scientists at the Monterey Bay Aquarium Research Institute as they retrieve jellies from the deep.

This episode of the U.S. Army's The Big Picture television series explores Ottumwa, Iowa, a city known for its priceless heritage and American way of life. With footage from the National Archives and Records Administration, this video is a visual record of Ottumwa at work, as well as its youth, schools, and religious institutions. An army recruiter helps young men make decisions about joining the service and explains why communities across the nation...

Weather affects our lives in many ways. Often, we take how much we rely on knowing and understanding the weather for granted. All living things must be able to adapt to the weather conditions in their region in order to live successfully. We will be more prepared to understand just what a powerful force it really is by understanding the various weather phenomena. This weather program highlights different forms of weather and introduces the concepts...

Whether it's a stretch of sand dunes in equatorial Africa or a cactus-covered plain in California, any place that receives less than ten inches of rain per year is considered a desert. By comparing and contrasting arid and semi-arid regions, this program provides students with a balanced picture of the Earth's desert biomes. The program also investigates how the few plants and animals that inhabit these ecosystems survive the extreme temperatures...

About a fifth of the Earth's land surface is tundra: cold, dry, treeless, and home to a diverse range of inhabitants including lichens and lemmings, sedges and snowy owls, and dwarf willow bushes and musk oxen. By viewing this program, students can develop a fundamental appreciation for the world's Arctic and Alpine tundra biomes. The plants and animals that populate tundra environments are clearly identified, along with the adaptations that enable...

This program features Angela Blackwell, Vice President of the Rockefeller Foundation. Ms. Blackwell is the former head of the Urban Strategies Council in Oakland, CA, and head of the nationwide Black Community Crusade for Children, which focuses on rebuilding black communities. In this program, she explains how "one caring adult" can save a child from a life of crime and violence.

The prairies of the American west, the pampas of Argentina, the steppes of Russia, and the veldt of South Africa all share at least one thing in common: they are covered with miles upon miles of grass. This program can help students learn to identify the climates, life-forms, and behavioral adaptations that correspond to each type of grassland biome. Factors that threaten the survival of these habitats' distinctive animal communities-and of the ecosystems...

In a groundbreaking expedition on Mount Everest, dozens of scientists converge to investigate what secrets the world’s highest peak has to tell us about our changing climate. The notorious Khumbu Glacier is mapped in stunning detail, biologists study extreme lifeforms, and a team of Sherpas and climate scientists climb straight towards the “death zone” to install the highest weather station in the world.

Australia is home to one of the world’s largest, most complex and amazing ecosystems: the Great Barrier Reef. This video explores the reef’s biotic and abiotic features, including coral formation and how changes in abiotic factors affect it; the food chain, nutrient cycle, and carbon cycle; and the impact of human activity. It is an excellent resource for middle/senior students of geography, biology, and environmental science.

learn about tropical grasslands known as savannas.