Experts debate the ethical implications of the revolutionary experiments on controlling rat brains via computer.

Iraqi scientists know how to make chemical weapons that can penetrate military protective clothing, and Iraq imported up to 25 metric tons last month of a powder that is a crucial ingredient to such "dusty" weapons.

Efforts to clone cows and other livestock pose few known risks to consumers, but scientists are increasingly concerned that genetically engineered fish and insects could escape into the wild, causing ecological havoc.