What is the definition of Nationwide Studies?

"Nationwide studies" are like a big, chaotic party where every citizen, from the tiniest village to the mightiest city, gets invited to share their thoughts, feelings, and experiences. It's the ultimate social experiment gone wild, where we try to understand the collective psyche of a country without breaking anyone's mind.

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Now, here's an unsettling example sentence: "In a nationwide study on 'The Art of Disappearing,' we discovered that all Americans secretly prefer to be seen in a mirror rather than being photographed with their hands out."