So, i need a little clarification -
if iam playing with Shoshon Pathfinder and have been able to discover 4 ancient ruins, does it mean , that i will get 4 techs (if i want them...) ?
No. There is a "cooling off" period (calculated as number of ruins, not turns) before you will get the same option from ruins as Shoshone. Give it a try. You'll quickly see how it works.