The Celts of Britain and the Celts of Gaul shared a belief in Druids, and they regarded trees as sacred.
The Germanic peoples originally lived in Northern Europe, including what is now Scandinavia, before spreading outward over time.
Both Vikings and Germanic peoples worshipped Odin, though he was called Woden in the Germanic languages, and the Germanic peoples also used Runes.
Druids were familiar with trees, while the Germanic peoples were more skilled at jewelry, inscriptions, and the like. Legend had it that Merlin of King Arthur's era once used Runes to "show them their future" to King Arthur.
Sometimes the most basic knowledge was the hardest. For example, Descartes had once pondered the question of what three plus two equaled: "Whether I am awake or asleep, two plus three will always equal five."
At the beginning of learning, people needed to gather objects from reality to construct equations, such as counting fingers. Once they had learned that logic, they no longer needed the external world to exist. Humanity separated quantities from physical objects and created symbols representing quantity—numbers. Runes, Greek numerals, Roman numerals, Babylonian numerals, Egyptian numerals, Chinese numerals, and so on all had their corresponding numbers.
Vernon had taught Dudley until he was furious. He thought it was simple because he had already completed the construction of the equation in his mind, while it had not yet been built in Dudley's.
Correspondingly, making Vernon tear down an equation already constructed in his mind and build another one was far harder than building one in Dudley's mind from scratch.
Dudley could play video games with ease. Harry, who was the same age, could actually have been Dudley's playmate, yet Pomona had visited their home several times without ever seeing Harry and Dudley sit together and play video games. Every