Scientific American, April 2005

  • by Scientific American
  • Narrated by uncredited
  • 1 hrs and 26 mins
  • Periodical

Publisher's Summary

Scientists who have long wondered why the polarity of the Earth's magnetic field occasionally reverses may finally have their answer. Also, a look at how the online industry is stepping up its measures to thwart electronic junk mail, a new way of approaching long-term problems that focuses on flexibility rather than cost-benefit analysis; and surprising similarities between humans and animals when it comes to dealing with personal economics.

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Book Details

  • Release Date: 01-04-2005
  • Publisher: Scientific American