The wonders of labratory science.

"After testing a variety of explosives, the FBI and other laboratories found that tiny amounts of substances -- so small they fit into a quart-size plastic bag -- can't blow up an airliner."

http://www.nytimes.com/aponline/us/AP-Air-Travel-Security.html?hp&ex=1159329600&en=35d863b63667dc66&ei=5094&partner=homepage