Agreed, but not sure if we call this selection bias.

Anyways, here's my perspective from someone who realized this even while growing up in a suburb in the Bay Area. My parents are blue collar workers (we've lived very comfortably through their hard work however), and so are a good portion of the folks in their social circle, but my city is largely made up of upper middle class and wealthy professionals, mostly tech workers. When I hit junior high/high school, I was taking the advanced classes with the kids of those professionals. I was among the more talented kids in my class, but in my senior year of high school I was working a drive-thru, while one friend had an internship at an architectural firm, getting an awesome chance to learn from a talented and successful architect (the friend's intended profession), and he wasn't the only one doing something like that over the summer. So one difference was that the other parents had connections that mine did not, and were able to give their kids a kind of exposure to the world that I didn't have. Even though the Bay Area has a wealth of resources for those interested in technology, I didn't know what existed, and nor did my parents. Nor did I know that I should have been asking around to dig these up.

The girl that this post is about is undoubtedly gifted and deserves to be recognized as one of the 20 under 20. Even if I did grow up with social, intellectual, economic and/or academic capital, I probably wouldn't have achieved that. But these sorts of differences do make me wonder about how many more geniuses could launch world-changing careers if all students had access to the resources this girl did, as well as being taught how to make the most of them.

One thing I feel the Internet has changed is how much personal connection matter. Prior to the Internet, one needed to be in the local area of a mentor or at least write a handwritten letter to someone a distance away to get help learning for an expert. This is NOT the case anymore and hasn't been for around two decades. When my son was 7 and wanted to see a model for each element on the Periodic Table of Elements, he couldn't find it in any of our books at home or in the local library, but he contacted a "science expert" on the Internet and got a link to such a resource (and later, did find a book on it). The week he turned 8, he read a book that excited his mind and he wrote the author an email with comments and questions; that man emailed him back in about an hour and became a mentor to our son even with the two living in different states (and did a lot to help our son form other connections), and indeed the man became our son's academic advisor for his MIT graduate education down the road. It's pretty easy for anyone to reach out and make connections today. My understanding of the history of the girl whose article started off this thread is that she had an interest in a topic and her father suggested she write someone who was an expert in that field, and that was how she got a mentor in CA; the girl was living in another country when she contacted the CA scientist. Anyone with access to a library with a computer connected to the Internet can get the most important of all resources - people resources. Spread the word if you know people who are still not realizing this.