News

  1. Climate

    Vikings may have fled Greenland to escape rising seas

    Vikings abandoned Greenland in the 15th century. Lower temperatures, an expanding ice sheet and rising sea levels may have played a role in their departure.

    By Freda Kreier
  2. Health & Medicine

    COVID-19 testing is complicated right now. Here are answers to 6 big questions

    There are two major categories of COVID-19 diagnostic tests. Here’s what you need to know when deciding whether to take an at-home test or head to the doctor.

    By Tina Hesman Saey
  3. Health & Medicine

    The CDC recommends mRNA COVID-19 vaccines over J&J’s, citing fewer risks

    Pfizer’s and Moderna's vaccines are more effective and cause fewer serious side effects than Johnson & Johnson’s jab, new data show.