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  1. Health & Medicine

    Early Start: Fetuses generate immune response to vaccination

    A fetus can manufacture immune cells and antibodies in direct response to vaccine given to the mother during pregnancy.

    By Nathan Seppa
  2. Earth

    Ice Age Ends Smashingly: Did a comet blow up over eastern Canada?

    An extraterrestrial object apparently exploded above Canada about 12,900 years ago, sparking devastating wildfires and triggering a millennium-long cold spell.

    By Sid Perkins

  3. 19839

    Rather than concluding that the object that hit Canada 12,900 years ago was a comet, I wonder whether there might not be an alternate reason that geologists haven’t discovered a large hole. If a meteor hit a kilometer-thick glacier, would it have left a crater in the rock underneath the ice? Peter ShorWellesley, Mass.