 In response, in June 2013 some of the original proponents published a re-evaluation of spherules from eighteen sites worldwide that they interpret as supporting their hypothesis.Skepticism increased with the revelation of documentation demonstrating misconduct and past criminal conduct.In 2012, scientists reported evidence supporting a modified version of the Younger Dryas impact hypothesis—involving a much smaller, non-cometary impactor—was found in lake bed cores dating to 12,900 YBP from Lake Cuitzeo in Guanajuato, Mexico.