This video segment from Kentucky Life describes how scientists control pollination of one of the few remaining American chestnut trees to develop blight resistant trees.

In this problem-based learning module, students focus on issues related to understanding the nature and transmission of the Rift Valley fever virus, a virus that causes the death of large numbers of livestock in Kenya and in much of sub-Saharan Africa, and can also infect humans. This module is part of Exploring the Environment.

In this video segment from NOVA scienceNOW, meet researchers who are studying obesity and trying to understand the role that hormones and genetics can play in regulating appetite.

In this video from Science City, meet Romiya Glover, a chemist who develops products for HIV/AIDS testing. She describes the multidisciplinary nature of her job, how she decided to go into science, and how her work benefits others.

Learn how ravens benefit from sharing information and working together in this video segment from Nature.

Learn about root systems of trees in the Congaree Swamp National Park in this video segment from NatureScene.

In this hands-on OLogy activity, kids learn how blubber acts as insulation between an animal's inner organs and the chilly ocean. The activity begins with look at blubber that explains how it works and how an animal's behavior and environment can affect the thickness of its blubber. The illustrated, step-by-step directions show how to make and test two kinds of gloves,one with a layer of blubber and one without. It includes a fun look at pilot whales and how they use their blowholes to release excess body heat.

In this video segment adapted from Northwest Indian College, Lummi Elders explain how a decline in the availability of salmon reflects a threatened environment that must in some way be protected.

In this activity, learners explore how different deodorants work. Learners treat agar plates with different types of deodorants and compare the bacteria growth on the plates to the control sample.

This article, part of Biodiversity Counts, examines site preservation, focusing on a new national park in El Salvador. The article discusses the questions faced as part of the decision-making process, the formation of an advisory committee in the early 1990s to study the park and make recommendations for how it should be managed, the committee's recommendations, and a description of those changes that are in the works, such as opening a portion of the park to the public.

This kinesthetic activity simulates the process of evolution by natural selection. Students take on the roles of crab-like predators that exhibit one of four variants of feeding appendage: a spoon, fork, knife, and chopsticks. The simulation runs for three trials, as the predators use their appendages to harvest pinto beans, with varying success. Students track the frequency of each appendage type through three generations. This resource is from PUMAS - Practical Uses of Math and Science - a collection of brief examples created by scientists and engineers showing how math and science topics taught in K-12 classes have real world applications.

This analysis and discussion activity is designed to develop students' understanding of the scientific process by having them design an experiment to test a hypothesis, compare their experimental design with the design of a research study that tested the same hypothesis, evaluate research evidence concerning two hypothesized effects of carbohydrate consumption, evaluate the pros and cons of experimental vs. observational research studies, and finally use what they have learned to revise a standard diagram of the scientific method to make it more accurate, complete and realistic. The specific effects analyzed in this activity are the effects of carbohydrate consumption on athletic performance and the effects of low-carbohydrate diets on health.

Students learn about scientific investigation by carrying out key components of the scientific method, including developing experimental methods, generating hypotheses, designing and carrying out experiments to test these hypotheses and, if appropriate, using experimental results to revise the hypotheses. Students design and carry out two experiments which test whether starch and protein are found in some or all foods derived from animals or plants or both.

At first glance, starfish, more properly called sea stars, aren‰ŰŞt doing much of anything. In this video, Jonathan‰ŰŞs investigations reveal a slow-motion predator that hunts and attacks its prey. Traveling the world, Jonathan investigates sea stars from the tropics to the Antarctic and uses time-lapse photography to reveal an amazing complexity to the world of the sea star. Please see the accompanying study guide for educational objectives and discussion points.

In Malaysia there is an island known for more sea turtles than virtually anywhere on Earth. In this video, Jonathan visits this amazing ecosystem to learn about the life cycle of sea turtles. He is surprised to discover an amazingly complex and competitive environment. Please see the accompanying study guide for educational objectives and discussion points.

This video from Thinkport introduces the seahorse, an unusual, endangered fish that has puzzled scientists who are attempting to save it.

In this video segment adapted from the College of Menominee Nation, tribal members share examples of how seasons are changing, and how these changes are affecting local plants.

In this lesson, based on the documentary Through My Eyes: The Charlie Kelman Story, students learn about the history and state-of-the-art of one of the world's most commonly performed surgical procedures--eye cataract removal and replacement.

This article, part of Biodiversity Counts, reports on the thought process of selecting a research site. The article has five tips from working scientists.

This video segment adapted from Northwest Indian College reveals how Native American life and knowledge is connected to natural cycles.