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Teacher's Guides for PBS segments

Blood vessel growth-or angiogenesis-is critical for developing fetuses and to heal wounds. But it is also an essential element of how cancerous tumors grow and spread. Here, see a step-by-step explanation of how the process works and how anti-angiogenesis therapies might stop tumors before they become deadly.

In this video segment from NOVA: "Cracking the Code of Life," Eric Lander of MIT's Whitehead Institute explains the effort to decode the human genome -- from motivation to process to importance -- and explains what a genome map can do for science and what it can't -- yet.

At about 3 billion letters long, reading and finding anything meaningful in the human genome is a daunting task. But that's just what genome researchers do. This interactive feature provides a microscopic view of some of what they've found on our 24 chromosomes, including the locations of about 200 different genes, especially those that have been associated with disease.

With moving personal stories from India, Japan, Kenya, and China, "World in the Balance" gives an up-to-date global snapshot of today's human family, now numbering 6.3 billion and likely to increase to nearly 9 billion by 2050. Paradoxically, the world is now careening in two completely different directions

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