Research on non-verbal communication strategies.
https://www.immi.se/intercultural/nr15/fajlik.htm
1 https://www.youtube.com/watch?v=uAJ4nEEBj9Q
2 https://www.youtube.com/watch?v=57oEVRrEy5k https://www.youtube.com/watch?v=k4nOI0ymPf4
3 https://www.youtube.com/watch?v=1g14Mva808s https://www.youtube.com/watch?v=ONrEVYZDVtA
4 https://www.youtube.com/watch?v=M7TA0XYzxpA
5