According to the author of Dawson's dawn man the hoax at pilgdiwn one of the main lessons the piltdiwn hoax can teach us is that

One of the lessons that the Piltdown hoax can teach us is that scientific discoveries must be questioned, analyzed and debated in detail and by different scientific groups.

Explanation:

The Piltdown hoax was a scientific fraud that consisted of presenting a skull as a fossil belonging to a human ancestor, the problem is that the skull was manually modified to look real and correct, in addition to being formed with parts of skulls belonging to different species. Farça was only discovered by the inquiry, investigation and debate of the entire scientific community, which had suspicions about the skull. This shows us that scientific discoveries can and should be contested whenever possible.

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.