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Sometimes, the simplest ideas are the most effective. Click or scroll on to discover 11 creations, ranging from the ingenious to the downright silly, that remarkably turned out to be million-dollar ...

This as-told-to essay is based on a conversation with Lily Cheng, 21, a game design student and YouTuber who lives in New York. The following has been edited for length and clarity. For the past year, ...