One notable example right before the launch, SpaceX engineers found a few cracks in the second stage engine nozzle extension.

The nozzle of an arc pistol should never be viewed directly, unless it is certain that no power is available to the equipment.

Ayrton's interest in vortices in water and air inspired the Ayrton fan, or flapper, used in the trenches in the First World War to dispel poison gas.