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Publisher's Summary

This December 2004 edition of Scientific American has a cover story about viruses, the bordering-on-inanimate beings that hold an uncanny power over the web of life. Also in this issue: new findings about natural brain chemicals that act like those in marijuana and can be used to treat pain and anxiety; results of a new computer analysis that casts doubt on the recent theory that 15th-century artists used mirrors to paint their landscapes; and more on the numerous dinosaur species recently discovered to have thrived in northern Alaska 70 million years ago.
Want more Scientific American? You can listen to previous issues by clicking on archives under periodicals.
©2004 Scientific American

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