How to research lost technology ?

three contents

   1⃣ when lost technology happens ?
   2⃣ how we research lost technology ?
   3⃣ how we stop lost of technology ?

1⃣ when lost technology happens ?

   point:
   ① precious info sometimes become unvisible 
   ② if tech become high level, sometimes hard to explains
   ③ connection on neural network

2⃣ how we research lost technology ?

   to research lost technology = to solve info blackhole

   ① to find where invisible info exist
   ② to research what kind of info inside
   ③ to research how they did that (  mechanism  )

3⃣ how we stop lost of technology ?

   ① easy to read text
   ② open study
   ③ not to concentrate on past oneself's Achievement 
       to find new Achievement = inprovement is important

   thanks