Among the difficulties facing the trial has been an ethical concern: enrollment is not voluntary.
Among the difficulties, the researchers said, are shuffling and trouble turning while walking.
Among the difficulties, he said, was determining the exact amount of the payments.
Among the difficulties they face is weighing the credibility of various threats, one senior police official said.
Among the difficulties, military experts say, are decoy tunnels and false entrances, the identification of which requires good intelligence.
The company suffered after Mr. Piszek bought Arthur Treacher's Fish and Chips in 1979 and had problems with franchisees, among other difficulties.
Among the difficulties is the uncertainty over how to approach companies with offices in or near the terrorist attacks, Mr. Day added.
Known as "black children", they are unable to go to school or obtain formal employment, and often have problems travelling, among other difficulties.
"Reality hunger" is an unwittingly apt phrase, because among the difficulties of this kind of storytelling is that one can never get enough reality into it.
Chief among the difficulties that scientists face: the political environment for new climate-science initiatives has turned hostile, and with the federal budget crisis, money is tight.
