Mr. Buchanan lists six factors that contribute to the DINK lifestyle and explain why today's culture mocks "the old idea that the good life for a woman means a husband and a houseful of kids."
For such reasons, we can assume that there must be an important random factor in neural development, and in particular, that errors must and do occur in the development of all normal brains.
It comments dialectically on the Silver Age's transmission of the traditional culture and its modern significance, which conveys the essential reason for the prosperity of the Silver Age.
Older tiles on Discovery look streaked from the plasma environment of re-entry. They stand out in photos because new tiles still appear a pristine dark black.