Sid Perkins is a freelance science writer based in Crossville, Tenn.
Sid Perkins' Articles
- NewsAnalyses of the shock waves recorded at seismic stations across northern Europe indicate that the Russian submarine Kursk sank due to onboard explosions, not a run-in with another vessel.
- NewsA 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.
- FeatureMany 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.
- NewsResearchers 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.
- NewsSediments from the Atlantic Ocean indicate that the now lush Amazon Basin was much drier during the latest ice age.
- NewsA 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.
- NewsDeath patterns from more than 400 volcanic eruptions through history may reveal ways to reduce the number of fatalities from similar causes in the future.
- NewsSediment 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.
- NewsBoth 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.
- NewsPollutants 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.