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  1. Humans

    From the January 5, 1935, issue

    Karl T. Compton, Einstein explains relativity theory, and controlling cancer cells.

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  2. Tsunamis and Other Natural Hazards

    The “Natural Hazards” section of NASA’s Earth Observatory Web site has many orbital images of tsunami damage resulting from the magnitude 9.0 earthquake that occurred near Indonesia on Dec. 26, 2004. The site also has links to orbital images of wildfires, floods, and erupting volcanoes. Go to: http://earthobservatory.nasa.gov/NaturalHazards/

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  3. Animals

    Mixing Genes: Bird immigrants make unexpected differences

    A pair of decades-long studies of birds moving into other birds' neighborhoods show that immigration can have a quirkier effect than predicted by the usual textbook view.