Bomb experts say that security checks are probably more likely to find the device that detonates a liquid bomb than the liquid explosive itself.

NPR: It's Hard to Spot a Liquid Threat to Airline Safety

During his life, Nobel was most famous for his experimentations with nitroglycerine, a highly explosive and unstable liquid.

BBC: Sweden��s Nobel gift to the world

He left the defense industry, and went on to invent the Mylar balloon, an improved version of Liquid Paper, and Kinepak, a kind of explosive that reduces the risk of accidental detonation.

NEWYORKER: Trial by Fire