The best way to commemorate 9 / 11 is to let the rescue heroes and all the victims "live"! "9 / 11" world peace park, an international non-profit organization, pioneered the new technology of "digital tombstone", which inputs all the video data of the victims of 9 / 11 into each of the victims' electronic tombstones, and reproduces the voices and faces of the victims of 9 / 11 and the rescue heroes of 9 / 11 with an electronic display! Remember them.