This is a really good question! WiFi signal strengths depend on the model of the WiFi receiver (which is in the iPhone) and the quality of the router sending out the signals.
Answer:
eye contact with the audience, thorough research, you must give your audience time to ask questions
It really would depend on what E-Mail system you're using.
If say, you're using G-Mail, the Recipient's address would be placed simply in the "To" bar right above the "Subject" bar.
Videoconferencing, as most people use that. <span />
