It will start automatically if your device runs QuickTime.
To stop it, click the left top of your mouse. To restart it, click the SPACE bar on your keyboard.
To show it on the full screen, click the right top of you mouse, then choose the full screen option.
To download it for personal use, put your mouse here on Prof. Lafforgue's Lecture 3 first, then click the right top of you mouse, and choose the download option.
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