PBS
Pbs Learning Media: American Chestnut Tree
This annotated slideshow adapted from KET's Electronic Field Trip to the Forest illustrates how blight decimated the American chestnut tree and the methods scientists use to identify and pollinate the remaining trees to create...
PBS
Pbs Learning Media: Dna on the Witness Stand
Dr. Eric Lander of the Human Genome Project explains the use of DNA as forensic evidence. He describes the process and need for standards in testing laboratories and discusses the use of DNA evidence as a human rights tool.