Please go to the DRHS 2019-2020 FB page to see an image of the solution.  Lay a nail on it's side. Alternatively place nails with the head of the nail near the nail that you have laid on it's side.  Add the 11th nail on top of the nails.  Pick it all up and balance it on the head of the nail.  Make sure none of the nails are touching the board.