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 gravitation to chemical relationship,...

And the prize for oldest living thing on Earth goes to . . . In this video from PBS Digital Studios, viewers learn about the oldest living things on Earth, all over 2,000 years old, such as bristlecone pines, baobab, sea grass,...

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...

Fish are no different when it comes to a living being's primary objective—to reproduce. They do differ, including from fish species to fish species, in their life cycles, survival tactics and reproductive strategies. After discussion of...

Star light, star bright ... just how long can you wish on that star? Well, it depends on its mass. The presentation explains the life cycle of stars based on their sizes. Scholars learn about the life expectancy of a star based on the...