How Old Is Old?

Groups of students create magazines that contain stories and images of one aspect of the ocean, and ocean life. The expectations for the final products are quite high, so this lesson will require some effort to properly implement. A...

A massive star has a mass greater than nine times that of our sun. Sal focuses on the fusion and chemical reactions that take place during the lifecycle of a massive star. He clearly explains the gravitational pull to the chemical...

All mammals have warm blood, are vertebrates, breathe with their lungs, have hair or fur on their bodies, and produce milk for their young. But not all mammals give birth to their young in the same manner. Watch a video that explains how...

From supernova to neutron star ... what's next? A video presentation describes a neutron star and its life in the universe. Learners then answer questions online to asses their understanding.

What are the odds of finding intelligent life somewhere else in the universe? The Drake equation can help us estimate the answer. Advanced astronomers find that perhaps the biggest determining factor is longevity of civilizations. There...

This PBS special explores the brain from birth to old age. Take a look at snapshots of brain development at birth, as a child, as a teenager, as an adult, and in old age.

This comprehensive study guide covers the main terms and concepts needed for a unit on the stages of life beginning at fertilization.

Eleventh graders research quality of life indicators for a list of countries looking at such things as infant mortality rate, and gross domestic product. They rank the countries from best to worst regarding quality of life issues.

When is a person no longer living? This question has been puzzled over for millennia, but is there a clear answer? Watch as this video examines the biological line separating life and death.

Statistical data on the population and demographics of 228 countries, including change, sex ratios, life expectancy, and percent with HIV/AIDS. There are also detailed explanations of the means of producing these statistics. It is...