Context: This technique was very expensive, though, and could not be used for applications such as telemedicine, distance education, and business meetings. Attempts at using normal telephony networks to transmit slow-scan video, such as the first systems developed by AT&T Corporation, first researched in the 1950s, failed mostly due to the poor picture quality and the lack of efficient video compression techniques. The greater 1 MHz bandwidth and 6 Mbit/s bit rate of the Picturephone in the 1970s also did not achieve commercial success, mostly due to its high cost, but also due to a lack of network effect —with only a few hundred Picturephones in the world, users had extremely few contacts they could actually call to, and interoperability with other videophone systems would not exist for decades.

Question: What is one area where teleconferencing could not be used?
Answer: telemedicine

Question: Who developed the first systems to transmit slow-scan video?
Answer: AT&T Corporation

Question: When was the first slow-scan video systems researched?
Answer: the 1950s

Question: What was the bit rate of AT&T's Picturephone?
Answer: 6 Mbit/s

Question: What was the bandwidth of AT&T's Picturephone?
Answer: 1 MHz

Question: Who developed the first system to transmit distance education?
Answer: Unanswerable

Question: In what area could business meetings not be used?
Answer: Unanswerable

Question: Why did using business meetings to transmit slow-scan video fail?
Answer: Unanswerable

Question: In the 1950's why did the Picturephone not become a success?
Answer: Unanswerable

Question: How many telephony networks were there in the world?
Answer: Unanswerable