Some of these mysterious ‘drones’ are indeed UFOs and should be taken seriously

In recent years, mysterious “drones” have hovered with impunity above sensitive government facilities, spurring urgent briefings at the White House and at the highest levels of the British government. Not only can the objects involved in these incursions evade detection and sophisticated countermeasures, they also demonstrate an array of extraordinary flight characteristics.

To be sure, some recent drone incidents are likely espionage or intimidation operations. But until conventional...