This story has been discussed elsewhere[0][1][2][3][4], but this article is a particularly clear, top-level description of the problem, the result, and the implications.

[0] https://news.ycombinator.com/item?id=10505231

[1] https://news.ycombinator.com/item?id=10506476

[2] http://www.scottaaronson.com/blog/?p=2521

[3] https://news.ycombinator.com/item?id=10508418

[4] https://news.ycombinator.com/item?id=10512074