[ WP ] Tomorrow , everyone wakes up with just the clothes on their backs and the knowledge in their heads . It is now 10,000 years in the past . How long does it take for us to recreate everything we have today ?

The event was thorough, ubiquitous, and devastating. In an instant every human being on the planet simultaneously found themselves stripped of every shred of civilization meticulously collected over thousands of generations of human progress. 
 
 The records at the beginning are incomplete at best. Some estimates derived from anecdotal evidence put the death toll at 1 billion in the first week. Those in northern climates succumbed to exposure. Heavily populated cities choked on masses of humanity piled upon themselves. Many simply accepted their fate as being a direct edict from their god and ended their own lives. Disease was rampant, stomachs accustomed to chlorinated drinking water were assaulted by bacteria from natural water sources. Without sanitation the disease burned like wild fire though populations. Starvation soon followed. In less than a month nearly 60 % of the worlds population, as estimated 4.4 billion people were dead. In many areas the bone fields are still visible today. Hundreds of acres of gnarled skeletons so white they reflect the sun and can be seen form miles away. 
 
 In 24 AE Collective scientists determined that humanity had been transported nearly 10,000 years into earths past using astronomy, geology, and biological data. In the early days, this was completely unknown. The remaining population had nothing. Hundreds of years of selective breading of crops was lost and the plants of the age were meek at best and poisonous at worst. Docile domesticated animals were replaced with fierce and dangerous imitations of their once familiar selves. Every well, shelter, dammed fishery, cleared field, path, road, or otherwise human influenced geographical feature was lost. Cities that once supported millions had their carrying capacities reduced to thousands. Billions more died through the first year as tribes and religious cults formed and warred over the remaining resources. By 7 AE the human population of the earth was reduced to 625 million. 
 
 Even in the early years efforts were made to preserve pre-event knowledge. Using crude bark paper and charcoal writing utensils engineers, scientists, poets, mathematicians and scholars set to work preserving their knowledge and recording post-event history. In 15 AE the Collective was formed in what once the Mississippi River Valley. It was from here that civilization was reborn. Using pre-event knowledge and developing new techniques the basis of construction and metallurgy was reestablished. By 20 AE corn and potatoes had been re-domesticated to resemble a sustainable crop. Bison were ranged off in large swaths of land near the collective and predators were killed using crude iron tools. In the year 23 AE the first sailing vessels set to sea and began the task of reunification. It would be a slow and painstaking process but in 74 AE the first transcontinental telegraph lines were completed across the former United States and Northern Africa. This magnified the available knowledge and the pace of progress increased. By 150 AE the decedents of the event were on their way of making this new world their own. Even today many question the validity of the event and question if it occurred at all. The possibility of a worldwide conspiracy aside one can only assume the truth of those who lived through this time. The current year is 1251 AE and the first silicon chip has been developed based on knowledge passed down from pre-event humans.
