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  1. Humans

    Letters from the April 28, 2007, issue of Science News

    Long ago gas Finding CO2 levels that are 2,500 times higher in 5,000-year-old fulgurites than in modern samples, scientists have speculated that the extra CO2 resulted from vaporization of organic material by lightning (“Stroke of Good Fortune: A wealth of data from petrified lightning,” SN: 2/17/07, p. 101). Could some of this gas reflect elevated […]

    By Science News
  2. Earth

    Earth 911

    Earth Day comes only once a year, but you can give Mother Earth a gift every day. The site Earth 911 makes it easy to be environmentally responsible. The Web portal offers ideas on how to recycle old electronics, dispose of hazardous materials, conserve energy, and shop green—and all its tips are tailored to your […]

    By Science News
  3. Humans

    From the April 17, 1937, issue

    Signs of spring, new elements in space, and the future of atomic energy.