Sid Perkins' Articles

  • News

    Rock guitarist inspires rock hounds

    A team of paleontologists who dug up a new dinosaur recently chose to name their find after singer-songwriter Mark Knopfler, guitarist and cofounder of the rock group Dire Straits.
    14 years ago
  • Feature

    Pinning Down the Sun-Climate Connection

    Many scientists propose that changes in the sun's magnetic field and radiation output during its 11-year sunspot cycle also affect the atmosphere, changing Earth's climate by steering weather systems and influencing the amount of cloud cover.
  • News

    Simple system may curb auto emissions

    Researchers have developed a four-component system that acts like an on-vehicle oil refinery and may help significantly reduce the hydrocarbon emissions from internal combustion engines.
  • News

    Explorers pinpoint source of the Amazon

    A five-nation team of explorers has used Global Positioning System equipment to confirm that the source of the Amazon is a snowmelt-fed stream high in the Peruvian Andes.
  • News

    Lake sediment tells of Maya droughts

    Sediment cores taken last year from the bottom of a lake on Mexico's Yucatán peninsula indicate that a series of extended droughts coincided with major cultural upheavals among the Mayan inhabitants of the area.
  • News

    Sediments show bipolar melting cycle

    Both the North and South Poles have experienced regular and simultaneous periods of significant melting during the past 3 million years, according to sediments from the ocean floor at high latitudes.
  • News

    Snowpack chemistry can deplete ozone

    Pollutants trapped in Arctic snow can be reactivated by sunlight when the sun returns to high latitudes in the spring, leading to ozone depletion in the snowpack and at low altitudes.