Future Time Machine Invention

¿The Boston university lecturer, time machine inventor, Jim and his student, johnny, time traveler both have gone into the future to the year 802,000 I and have come back present in final jounrey, after they had experienced several different future time journeys. They expect to find a better world with highly intelligent people and great inventions. Instead, they find that people have become weak, child-like creatures. They dance and sing, and wear flowers. They seem happy, but they also felt fear. Whether what cause they felt afraid, but why are they so frightened when they knew whether what will happen in the future ? And who or hat has stolen their time black hole wall machine? Will these two time travelers, ever be able to return to the present ?