C92 I Am Your Teacher Shen(1)

"This is the sparkling water you saw in the cartoon yesterday. Some of you might not have tried it before, so go ahead and give it a taste," he said, handing out straws. "Give it a try on your own."

"This is for making bubbles. You don't need to understand the principle just yet—just have fun with it. It works best in daylight, where the lighting is better