Ever heard of nitroglycerine its clear,and can be detonated by impact,flame or spark.It is easily extrated from dynamite by a procsess called ''sweating''.  Liqhid explosives are real,perhaps if mid easterners were banned from flying on our airlines that would negate the likelihood of explosions.At the very least they should be forced to fly stripped naked and shackled together under the watch of an armed air marshal,this includes women and children.