'Explosive' evolution in pupfish

Two groups of small fish, one from a Caribbean island and one from the Yucatan peninsula of Mexico, exhibit some of the fastest rates of evolution known in any organism, according to a new UC Davis study.

Hurricane Lisa menaces Central America

The northern part of Central America was on high alert Wednesday for the passage of Hurricane Lisa, with warnings of devastating winds, downpours and flash floods also affecting Mexico's Yucatan peninsula.