Walnuts may date as far back as the Neolithic period—more than 8,000 years ago.4
The Romans called walnuts “Jupiter’s royal acorn” or Juglans regia.4
Remains of well-preserved walnuts were unearthed in the ruins of Pompeii.4
In the 16th and 17th centuries, the medical profession adopted the Doctrine of Signatures that assigned remedies to natural sources based on their resemblance to different body parts. Because of the walnut’s resemblance to the brain and heart, it was thought to help those parts of the body, and today’s research proves this to be true.4
It would take more than one billion in-shell walnuts laid end-to-end to go around the Equator one time.5