We thought we were surely dreaming when we heard over the radio this early morning that Scotland Yard had successfully foiled a terrorist plot to blow up nearly a dozen airplanes in mid-flight. The plan evidently revolved around liquid-based explosive devices, to be smuggled on board in hand luggage. After 21 people were arrested in London and surrounding areas, a nation-wide "critical" threat level was announced by UK security service MI5. This status is......