Actually it is a bit of a dogs breakfast.
For scientists the best bonus fully counts and then the next counts less, and the next one somewhat less...
Nah, it's 3 top skills of each type from 3 top scientists at the same location, but you need to have an additional 3 research facilities of each type (hightech, weapon, energy), one of each kind for every scientist and keep best 3 of them in the same space port, to also get the research location bonus.
Then - their bonuses fully stack.
If you want to fully utilize all bonuses, you need to have 9 scientists at 3 different locations with three 50% bonuses, one of every kind (hightech, weapon, energy) and 3 additional research facilities of the same type as the location bonus. You need to keep the scientists at the space ports, afaik.
edit.. I may be wrong wrong.I need to recheck it, again..
< Message edited by deathnoise -- 7/11/2014 2:24:55 AM >