Fifty years of speculation has offered no solution to how birds fly.

Fifty years of speculation has offered no solution to how birds fly.

Science reporters routinely speculate about things they can't possibly know.

From two sexes to sixty genders in only a few decades. Are they inborn? New research reeks of speculation.

An instance has been found of James Clerk Maxwell's speculation about overcoming entropy.

In 1792, a group of New York bankers gathered by a famous tree on Wall Street and signed the landmark “Buttonwood Agreement.” Against a backdrop of speculation and deceit, the document signaled a return to openness, fair dealing, and integrity among New York's financial sector. Eventually, the Buttonwood Agreement became the basis for the New York Stock Exchange. Today, corporate America faces a different crisis of values.Â