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I can't believe anyone would do a study about this for two reasons.

First, well, duh. Don't need a study to tell you this.

Second, was this done for someone to explain why they're not successful? A lot of people want to justify a lack of effort because the chips are stacked against them. All any of us are supposed to do though is be the best version of ourselves we can be.

There will always be someone smarter, taller, better looking. Who cares? Do your best.