He responded by saying: "Now we must redefine 'tool', redefine 'man', or accept chimpanzees as human."

VOA: special.2009.11.18

Researchers have also found that sunlight is an important tool used by butterflies.

VOA: special.2010.04.27

written by Carl Sandburg. Here is the first part of the poem: Hog Butcher for the World, Tool Maker,Stacker of Wheat, Player with Railroads and the Nation's Freight Handler;

VOA: special.2010.01.10