Scientists are training computers to help us stop asteroids from crashing into our planet.
An exceptionally strong El Niño may have caused 1876-1878 famine that killed tens of millions.
Scientists can now link "acts of God" to climate change. That could give victims the power to hold someone accountable, say lawyers.
A panel of researchers discussed the need for a system to warn the public about health risks from wildfire smoke, similar to the National Weather Service's heat advisory.