"We have limited information," Mel said, on the way down.

That is because efforts to limit information usually just raise more questions, not only among reporters but among voters.

At the time, Felt only had limited information, remaining unclear as to whether it was a burglary or bombing attempt.

"Instead of limiting money," the authors write, "we might limit information."

The secondary intention of the policy, the officials said, is to limit information that might give pranksters ideas.

To the Editor: Another call to deal with potential risk by limiting scientific information.

Are there gradations of censorship, better and worse ways to limit information?

"No matter how smart we are, we officials have limited information," he said.

"I have limited information with which to work," said Hunter.

The Chinese government's obsession with control extends beyond the mission itself: it also limits information about the program.