News

  1. Paleontology

    Caribbean Extinctions: Climate change probably wasn’t the culprit

    Remains of extinct sloths unearthed in Cuba and Haiti indicate that the creatures persisted in Caribbean enclaves until about 4,200 years ago, a finding that almost absolves climate change following the last ice age as a cause for the die-offs.

    By Sid Perkins
  2. Health & Medicine

    Defense Mechanism: Circumcision averts some HIV infections

    Men who get circumcised reduce their risk of acquiring the AIDS virus by more than half.

    By Nathan Seppa
  3. Health & Medicine

    Single drug dose may be better against cholera

    A single dose of the antibiotic ciprofloxacin cures cholera in children as often as a 12-dose regimen of erythromycin does.