An unidentified substance has killed or injured hundreds of birds so far.
For long-term earthquake planning in the Mississippi Valley region, we need to know whether earthquakes are fading away, as some suggest, or not. A new study argues that we're in a "steady as she goes" phase.
Nature shows almost no signs of the Loma Prieta earthquake 24 years later. But the human landscape still carries scars that should remind us to practice continual preparedness.