You can argue that learning another language well is more taxing than, say, learning to play chess well—it involves sensitivity to a set of complicated rules, and also to context.
On design selection, exclusive design of blue bricks, through water, ball mill, modeling of complex process, the formation of historical traces and conforms to the modern aesthetic sense.
In search of many social and economical systems, it is found that node strength distribution as well as degree distribution demonstrate the behavior of power-law with droop-head and heavy-taft.
At the top of the list is the notion that intelligence is measured by your ability to solve complex problems; to read, write and compute at certain levels; and to resolve abstract equations quickly.
In the late twentieth century, archaeologists discovered the remains of a sophisticated people whose settlement might have been the hub of a civilization few people even thought existed.