"Dean, regarding black hole theory, advanced quantum mechanics, and wormholes, you have already learned quite a bit. Next, we can start with advanced studies."
"Thank you, Einstein teacher, I've learned a lot recently!" Fang Jueyu walked out of a classroom, rubbing his temples slightly due to mental fatigue.
Ever since Xiao Yi told him about the Sage Crystal, Fang Jueyu had developed a worrying preoccupation. Since advanced intelligent beings had once appeared on Earth, would they return in the future?
Those beings possessed more advanced civilizations, technologies, and weapons than Earth. If another civilization discovered the large quantity of Sage Crystals on Earth, it could bring about another catastrophe.
According to Xiao Yi's estimates, prehistoric civilizations on Earth were almost progressing from level one to level two, at least tens of thousands of years more advanced than Earth now.
