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| Leukocytes – white blood cell |
| White blood cells are the basic element of the human immune system. They protect our bodies from bacteria and viruses. In this video, you can see how they attack and destroy bacteria. Imagine this is happening in your body as we speak.. |
 Category: Knowledge  From: Siemen  Added: 14:47 12/01/2010  Rate: 0.00 / 0 votes  Views: 650  Comments: 0  Tags: Leukocytes white blood cell
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| Lifetime of a star |
| 12 billion years of a star lifetime shown in just 6 minutes. This video shows the evolution of a star from a red giant to a white dwarf. |
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Category: Knowledge From: Siemen Added: 18:49 05/01/2010 Rate: 0.00 / 0 votes Views: 605 Comments: 0 Tags: star life bang white dwarf red giant
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