The drone “melts” in water – ideal for spying and helping destroy the evidence. Scientists at NASA have led the development of the new aircraft, which is made from fungus and recently made its maiden flight. One use of the technology could be to fly covert spying missions and then once complete to crash the drone into water to avoid detection. The drone’s body is made from mycelium (the vegetative part of a fungus) covered by protective sticky cellulose “leather” sheets…