Australian scientists have revealed the bacterial killing potential of black silicon, a type of silicon that has been etched to create long narrow nanoprotrusions on its surface. The Wandering Percher dragonfly (Diplacodes bipunctata). Insets show 3D reconstruction of the upper surface of black silicon, upper left, and the surface of the dragonfly forewings. Earlier this year the team discovered that the wing of the cicada Psaltoda claripennis can...