December 19, 2001

Technology expert Heather Newman returns to talk about pros and cons of the iPod system, and PDA's for holiday gifts. She gives some ideas about what to do with old cell phones, such as donating them or keeping them as emergency back-ups.

New research conducted by Mark Haussmann at Iowa State University suggests that we can determine an animal's age by looking at a sample of its blood. In the past an animal had to be killed. He explains how they measure the length of certain DNA sequences, which get shorter as the animal ages.

We could be headed for a mass extinction, claim some scientists. Todd talks with ecologist Andrew Balmford about extinction issues, their ramifications, and how focusing on the conservation of entire ecosystems, not only individual animals, will help. He discusses methods used to determine the effects and likelihood of mass extinction, and the responses from the general population.