A two-faced phone? From the front the YotaPhone 2 is a conventional Android smartphone with a color display. Flip it around and there's a monochrome screen. The extra screen uses the same low-power tech found in e-readers
A new machine can gather and transmit data while flying 50 meters above a car. The Israeli-made Sky Sapience HoverMast is a general-purpose intelligence-gathering craft that can carry up to 9 kilograms of equipment like radar systems or sensors.