Hello, maybe someone could help me with someting i don't understand with Sophon :

I'm in round 90, and row 5 tech asks for 39797 science... It seemed expensive to me and I wanted to check on a new game the cost in science. 

When I start a new game (with the Sophons) we can see on the technology tree the following costs (in science) : 

- Rank 1: 131

- Rank 2: 158

- Rank 3: 788

- Rank 4: 2102

- Rank 5: 5256

But on my current game the cost of technology: 

- Rank 1: 995.

- Rank 2: 1194

- Rank 3: 15919

- Rank 4: 39797

Why the difference? What is the reason for it? 

The more you research the more they cost.

Ok thanks but do we know how much does it increase each time ?

You can relate to this spreadsheet.

Thank you !