All of this is reflected in rising living standards and a burgeoning middle class that is busily splashing out on cars, washing machines and holidays abroad.
The best thing is to let children encounter these challenges from an early age, and they will then progressively learn to master them through their play over the years.
Generation X, of which I am a member, was probably the last to grow up with the Top 40 and only a few TV stations—and the kind of common taste that this structure instilled.
Women's scarcity in top organizational ranks may simply represent the cumulative effect of a constant—or even decreasing—disadvantage at successive hierarchical levels.
Jacob Milgrom has argued that there's a kind of Archimedean principle at work here: every sin creates an impurity that encroaches upon the realm of holiness and displaces a certain amount of holiness.
The objects are added to this space until there is not enough contiguous space to satisfy the request for the next object being placed on the heap (see figure 2).
The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation, so that a cycle of progressive surface deterioration is established.
In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.