21.   How it changes tells historians as much about the technological developments as it does about the interface between human and machine.

22.   He predicted that if technological developments maintained their current momentum, it would soon become possible to use sunlight to derive hydrogen fuel from water.

23.   INSET allows librarians and teachers to examine new approaches, to improve personal skills, increase productivity and keep up to date with new technological developments.

24.   It provided finance, ensured protection and, on occasion, encouraged technological development.

25.   But, although many authors appear to be optimistic about technological developments, morally and ethically most seem to be pessimistic.

26.   And many engineers want to remain in the Silicon Valley to keep up on the latest technological developments involving the Internet.

27.   And technological developments, like digital video disks pose another big question mark.

28.   As with many new technological developments in America, the content is lagging.

29.   But technological developments may soon make buying a plane ticket from a computer routine.

30.   Earlier technological developments left their mark on the language.