The previous world record of 29:31.78 was held by China's Wang Junxia, set 23 years ago in 1993.
In the greatest 10k of its era and certainly one of the two or three greatest in history - women's or men's - the all-time lists were completely rewritten as four runners broke 30:00 minutes.
There are small bits of insanity in these results.
Eight national records were set, including that of the United States by Molly Huddle in 30:13.17 in 6th place.
The first 13 runners set personal bests and 18/35 finishers did so.
Former US citizen Alexi Pappas, now running for Greece, set the Greek national record of 31:36.16 - and finished seventeenth.
Most striking is simply this:
Kenya's Vivian Cheruiyot was second, Ethiopian legend Tirunesh Dibaba 3rd, and Kenya's Alice Nawowuma finished 4th after having done much to set up the race for Ayana in the first 5 kilometers.
If anything, it appeared Nawowuna was headed for bronze until Tirunesh Dibaba and she traded places twice between 7 and 8 kilometers, with the Ethiopian veteran pulling away to win the battle for 3rd.
Imagine running 29:53.51 and finishing 4th.
In my preview of this race I suggested that it was time for the 22-year-old Nawowuna to run an open 5,000m race to break her prodigious 15:16.74 - run when she was 16 years old.
Today she did just that.
She led the race at 5,000m in 14:46.81.