He can't explain it. AFAIK none of the Human Calendars can, there have been studies. I reckon it's memory related, he has an incredible memory and can tell you

He can't explain it. AFAIK none of the Human Calendars can, there have been studies. I reckon it's memory related, he has an incredible memory and can tell you everything he did on a specific day in the past! Maybe at some point he just scanned the Windows calendar or something!? We (and his teachers) can't work it out.