"Do you want to hear about the egypt eating parasite next..?"
"Is it some kind of plague or just another literal oversized parasite."
"Actually, It's a bit of both."
"Nice, wait no..."
"A Parasite... or more of parasites..."
"What do you mean?"
"At the start of 38th century, Egypt became the global superpower by the revival of the 'Oldies'. The oldies are the great minds behind the constructions of great pyramids. These knowledges were lurking beneath the Nile river like minerals. Only after being extracted by unsuspecting individuals looking for oil, the knowledges were released into the water source affecting anyone who drinks it."
"How are those wisdom minerals stored underground."
"For throughout history, they thought only the high ranking people were mummified. That was until they found the masses of bodies buried a few layers underground below the river. Thousands upon thousands of skulls and they were green. Archaelogists speculated that these skulls belonged to the forgotten geniuses that history forgot."
"Was time travel not available at that time to check who were they?"
"Time travel did exist at that time but the problem is not about time machines. When I said history had forgotten, I meant it literally. The history itself never knew they existed. When they went back in time to see, there were not any signs of them being buried. Not any period... they checked every historical events recorded or unrecorded till toward even the 19th century... none. The speculation of them being great minds of egypt remained a theory."
"So... about the parasites?"
"Sorry... I got carried away over there. After Egypt becoming a global superpower after the fall of USA in 40th century, the government wanted to focus on the development of medicine. At that time, the world was suffering from the time flu caused by the same people who kept checking every single seconds of Nile's past in search of the oldies."
"Is the time flu came from travelling time since bacterias evolve over time."
"Correct... Normally the time flu would only effect the people from past by the people of future but when the future people arrived and left, the diseases they left somehow mutated into something that becomes more severe through generations. Without needing to kill the host, the symptoms became stronger over time. Since the past is effected, so is the future. With older generations able to resist well enough, the younger had it harder and harder as the time passed."
"But how would that successfully infect the future generation without the stronger bacterias killing the middle ones."
"Nutritions. The more advanced humanity had become, the better quality of foods were produced. The flu could not kill the middle generations since their immune systems were tougher. May be a few millions or billions died throughout the ages, but it wasn't lethal enough to cause extinction. Now back to the parasite part."
"Wait... if the humanity especially egyptians, can time travel, why didn't they try to improve the past and in return become far more advanced in the present. Or did they tried that already?"
"You'll find that out later... anyway the parasites. In haste, to cure the time flu, some of the scientists suggested that they should fight fire with the fire. They constructed artificial parasites to battle the bacterias. The parasites were slightly larger than bacterias, in tentacle shapes and wiggled in odd way. What happened next was that when working for the cure, the researcher found these parasites were strangely... amusing.
The cure was already ninety nine pecent in completion. But the researchers wanted to add more... To decorate the parasites more. They couldn't get enough with observing them through microscope. They wanted to see them with naked eyes. They made the parasites bigger. They could not be satisfied... even more bigger and bigger and bigger. Soon big enough to consume the river of Nile itself. They became uncontrollable... They went rampage.
Eventually, the UN of their time called 'SOAP (the Supreme Organization of Absolute Power)' came just in time and send them into the time river."
"The time river?"
"When the time machines travel to past or future, they had to go through the time river. They were sent into that dimensions and sealed forever. That was the end of time travelling."
"But... I came here by travelling in time."
"Oh... when I said the end of time travelling, I didn't mean it as time travel can no longer exist. We cannot travel in time for legal reason unless it's your first time accidental travel, which means you cannot travel more than once."
"I see... which means I can never go home then."
"Unfortunately yes."
"But how was the time flu cured?"
"When the time river was sealed, the past and future consequences also disappeared including the flu. They went back into primitive state for a long time until 43rd century, where the time river was unsealed after starving the parasites to death."
"Damn old people..."