51.   But they are an efficient way to thin forests.

52.   But, increasingly, advertisers are finding more efficient ways to reach those audiences.

53.   Castanet helps automate the process by providing an efficient way for computers on a network to retrieve and distribute new versions of software, mostly during off hours.

54.   Companies are also turning to Web conferences as an efficient way to train employees or clients.

55.   Critics have also attacked the government for spending too much in the drive to find more efficient ways of operating.

56.   Cyterra chief executive David Fine says the method is the most efficient way to get an extra look into cargo.

57.   Dr. Uwe Reinhardt, a health care economist at Princeton University, said audits like these are an efficient way for the government to hold down fraud.

58.   Dirty needles have always been the most efficient way to spread the AIDS virus.

59.   E-mail usually is the most efficient way to handle office matters.

60.   For now, DNA computers are slow and clumsy, but their logic applies to everything from codebreaking to finding the most efficient way to visit multiple destinations.