This video segment from Outdoor Nevada examines threats to the desert tortoise population.

This activity is a lab where students will design an experiment dealing with one of the five senses. Students will collect data outside of class, write a formal lab write up as well as a group presentation on their findings.

This activity is a lab where students design an experiment to test the rate of photosynthesis. Students will analyze data,write a report using the scientific method, and apply results to current environmental issues.

This video from Nature offers a description of desirable traits in beef and dairy cattle.

In this video segment from Nature, scientists question how animals mysteriously survive natural disasters.

In this activity, students will investigate how much chlorophyll is in olive oil using a Varnier Spectrometer. Students will measure and analyze the visible light absorbance spectra of three standard olive oils obtained from any supermarket: extra virgin, regular, and light.

This video segment from Greater Boston examines whether environmental toxins may be to blame for a rare skin disease.

In this video segment from Nature, learn about six different breeds of cattle.

Diffusion is the net movement of particles from areas of high concentration (number of particles per unit area) to low concentration. In this activity, students use a molecular dynamics model to view the behavior of diffusion in gases and liquids.

Movement of ions in and out of cells is crucial to maintaining homeostasis within the body and ensuring that biological functions run properly. The natural movement of molecules due to collisions is called diffusion. Several factors affect diffusion rate: concentration, surface area, and molecular pumps. This activity demonstrates diffusion, osmosis, and active transport through 12 interactive models.

This lab activity is a paper fossil dig where students discover skeletal characteristics of humans, primates and hominids and are asked to make a short oral presentation to the class.

This article recounts the events on the day in 1990 when Dr. David Elliot, an Ohio State geologist, found a dinosaur fossil high in the Transantarctic Mountains of Antarctica.

This expository article for elementary students describes the dinosaurs that lived in polar regions as well as the adaptations that helped them survive in the dark and cold environment. Modified versions for younger grades are available.

The disappearance of bees will have tremendous impact upon the way we live according to scientists in this segment from Nature.

Students disassemble and analyze retractable pens. Through the process of "reverse engineering," they learn how the ink pens work.

This video segment adapted from A Science Odyssey tells the story of researcher Sir Alexander Fleming, whose luck and scientific reasoning led to the groundbreaking discovery of penicillin.

In this video segment from NatureScene, observe some methods of plant identification with regards to the diversity of hardwoods at the Congaree Swamp.

This video segment from the Science and Technology Chat series focuses on dolphin pregnancy, birth, and care of the young, and features Atlantic bottlenose dolphins living in captivity at the Mirage Resort Dolphin Habitat.

Dr. Stephen O'Brien of the National Cancer Institute discovers a 700-year-old mutation that makes a person resistant to HIV infection. From Evolution: "Evolutionary Arms Race."

This video segment from Kentucky Life explains the differences between dragonflies and damselflies and explores their habitats.