61.   At Illinois, teaching is the main source of financial aid for graduate students in the humanities and social sciences.

62.   Because Alabama tax revenues, a main source of education funding, are dwindling, schools and universities are facing significant budget cuts.

63.   A main source of tension in the courtroom had been her insistence that the lawyers keep their questions sharp and relevant.

64.   A new publisher who tried to broaden the reach of the newspaper, therefore, could risk the loss of a main source of revenue.

65.   A virus that periodically sweeps through the region has killed all the village chickens again, robbing people of their main source of animal protein.

66.   A spokesman said the main source of income is rental of public rooms for special events.

67.   According to the American Dietetic Association, carbohydrates are the main source of fuel for working muscles.

68.   All the reactors are the main source of employment, and the only source of heat, for the towns where they are located.

69.   All have lost access to their lands in the midst of the coffee harvest, the main source of income for most peasant families in the highlands.

70.   Also, the use of light to transmit information will be the main source of how information will move for at least the next decade, if not longer.