Teachers who cannot turn up to lectures can provide a service for the students so they can stay up with work and not miss out, also if the teacher is away in another country the students can be there available over a service such as Skype and they can deliver the lecture through this service.
Skype is a service that is free which provides the user with the ability to connect with friends, family and other personals. Also it enables you to make calls to many countries either a home line or mobile but that is only done by buying Skype credit, also multiple video call feature is available on the paid membership and this is a great feature of Skype as it would be really useful for businesses that have investors in different countries.
reference - Skype Explained Visually (http://www.youtube.com/watch?v=m1mflr-kQlk)
Channel - http://www.youtube.com/user/SayItVisually?feature=watch (Jordan Schaffel
Imagine getting lectured from someone in China to the UK... that would be awesome!
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