11.   Still unknown is whether anthrax found in a letter sent to Daschle is the same strain as the Florida and New York material.

12.   Still unknown is whether people can pass it to each other, making an epidemic possible.

13.   Still unknown, he said, is the impact light rail will have on traffic patterns and road dust.

14.   But still unknown is whether the fire passed from the center tank to the wing tank, or the fire traveled the reverse path.