Sid Perkins

Sid Perkins is a freelance science writer based in Crossville, Tenn.

All Stories by Sid Perkins

  1. Planetary Science

    Warmth in the dark age

    Lower reflectivity kept Earth from freezing under a fainter young sun.

  2. Planetary Science

    Signs of giant comet impacts found in cores

    An uptick in ammonium may be evidence of a 50-billion-ton strike at the end of the ice age.

  3. Paleontology

    Tyrannosaurs lived in the Southern Hemisphere, too

    Australian fossils suggest the kin of T. rex dispersed globally 110 million years ago.

  4. Earth

    Bacteria show new route to making oxygen

    New discovery adds to the few known biological pathways for making and metabolically using the gas.

  5. Paleontology

    Fossilized poop bears tooth marks

    Shark-bitten fecal matter probably came from an assault on an ancient croc.

  6. Ecosystems

    Iron fertilization in ocean nourishes toxic algae

    Efforts to prevent global warming by fertilizing the oceans with iron could trigger harmful algal blooms.

  7. Life

    Chameleon tongues snappy even when cold

    Collagen gives the creatures a bug-catching advantage in chilly conditions.

  8. Earth

    Arctic seafloor a big source of methane

    Measurements show that Arctic undersea methane deposits, previously thought to be sealed by permafrost, are leaking into the atmosphere.

  9. Earth

    Earth knocked for a loop

    Chile’s February 27 temblor, tectonically linked to another giant quake 50 years ago, sped up the Earth’s rotation and tipped the planet’s axis.

  10. Paleontology

    Ancient DNA suggests polar bears evolved recently

    A study of a rare Norwegian fossil narrows down when polar bears evolved and finds they are closely related to modern-day brown bears in Alaska.

  11. Life

    Hydrothermal vents sometimes colonized from afar

    Deep-sea currents can waft larvae hundreds of kilometers.

  12. The carbon footprint of industrial whaling

    Blog: Over the past century, whale hunting released 128,000 Hummers’ worth of carbon into the atmosphere