Global warming threatens tropics
While the most significant harm from climate change so far has been in the polar regions, tropical plants and animals may face an even greater threat, say scientists who studied conditions in Costa Rica.

All eyes turn to world leaders
As finance ministers of 7 largest economies meet, hopes rise that coordinated action will solve crisis.

DNA test proves it -- baby shark has no father
In a study reported Friday in the Journal of Fish Biology, scientists said DNA testing proved that a pup carried by a female blacktip shark in a Virginia aquarium contained no genetic material from a male.

Global stock selloff
Markets fall on fears about world crisis - expectations mount for response.

How bad could the economy get?
Before the meltdown, economists fell into two camps: those who thought the economy had already slipped into recession and those who thought a recession could still be avoided.