Bats, butterflies, roaches, mosquitoes, and birds: The coming micro-drone revolution

Bats, butterflies, roaches, mosquitoes, and birds: The coming micro-drone revolution -- Science & Technology -- Sott.net: "The drones coming to a neighborhood near you will be small, some nano in size, capable of flying through city streets and buildings almost undetected, while hovering over cityscapes and public events for long periods of time, providing a means of 24/7 surveillance."