Sam's Youtube Video for term 4: https://www.youtube.com/watch?v=AKjuBSTTc8Y
Nelson's youtube video for term 4: https://www.powtoon.com/show/ckFw0wlPMWC/how-have-trade-begin-and-changed-the-world/#/
Jeonghun's Video Link for Term 4: http://www.powtoon.com/show/eB20V0C5Fzk/global-trade/#/
Rafael's youtube video for term 4: https://www.youtube.com/watch?v=OHBXKIITVg8