When a really infallible scientific bureau makes a drastically serious error, the data must be wrong ... but wrong in what way? he first morning that they were fully committed to the planet, the executive officer stepped out of the ship. It was not quite dawn. Executive Hafner squinted in the early light; his eyes opened wider, and he promptly went back inside. Three minutes later, he reappeared with the biologist in tow. "Last night you said there was nothing dangerous," said the executive. "Do