An affine transformation does not in general preserve angles between lines or distances between points, but it does preserve ratios of distances between points lying on a straight line.

When they reached the river, Nqunuse's daughter's billycan began to leak.

Once in a while a design feature shows up in animals that are not closely related. A good example is the eyestripe coloration pattern, which appears in sparrows, antelopes, and chipmunks. In all these creatures, a dark facial stripe runs from the snout to the eye. … Presumably eyestripes serve as protective coloration in all these prey animals, disguising their eyes from predators.

It's all right. An Englishwoman there lammed into me last night, first about the atom bomb and then saying that I must be a fanatic.