This isn't really a question, but I came across the following passage:
>If, for in stance, I determine the wight of each stone in a bed of pebbles and get an average weight of 145 grams, this tells me very little about the real nature of the pebbles. Similarly, in human psychology, a mass of data tells us nothing of the individual.
>a pebble
>145 gram (average)
Is this because native English speakers are not familiar with the metric system?