That could be good advice. If you strike high up on a tree with an axe, the chip of wood that is cut off will fall into your eye.
VOA: special.2010.01.17
If the ratio of magnesium and iron on the moon conforms with scientists' predictions it will provide evidence that the moon really is a chipoffthe old block.
If a camera detects a blemish on a chip, it sends a signal to one of the airhoses under the conveyor, and a jet of air blows thechipoff onto the floor.