21.   Throughout the journey, the two former teachers have used high-tech computer equipment to relay their experiences to schoolchildren around the world via the Internet.

22.   Throughout the journey, the two teachers have used high-tech computer equipment to relay their experiences to schoolchildren around the world via the Internet.

23.   Throughout the journey, the two teachers plan to use high-tech computer equipment to relay their experiences to schoolchildren around the world via the Internet.

24.   The rush is on among software makers to refine technology enabling people to telephone around the world via the Internet for a fraction of the cost of traditional service.