Olympians used to be selected from just a few million people, almost purely European, then it was hundreds of millions, now it is from billions. There will always be statistical outliers, and the greater the total numbers, the more extreme the outliers will be, particularly if we embrace the genetic diversity in Africa and Asia. People have also woken up to going for medals, rather than records, which means fast finishes. This is my naive explanation for what we have seen in the last 2 weeks. It may well turn out that one or two performances have been drug/transfusion enhanced, but should we not wait until the evidence emerges?