Different tech costs by traits?

[Theben]

I noticed something for the 1st time yesterday. I was playing Tokugawa, and had a choice between agriculture and archery. Both were cost 0/144(epic), no points rolled into either yet. But the listed time to research archery was 7 turns while AGRI was 9 turns!? There was also another identical cost set of techs, one was less turns than the other.

Today I played Sitting Bull and had the same thing happen but the reduced research time was Scientific Method (6), vs another tech which I forget but was 7 turns.

It seems that the quicker techs in both cases were associated with the leader's traits. Is that what causes this? Has this been reported before? I'm playing 3.17 BtS.

[snoopy369]

That's because you gain a bonus to research when researching a tech another leader (or other leaders*) has (and it differs by the number of civs holding that tech). Also, if you have both optional (or all 3 optional, or 2 of 3, or whatnot) prereqs to a tech that has multiple optional prereqs, you gain a bonus. Both are reflected as a bonus to research, not as a discount on beakers needed.

[Theben]

Hmm ok. No one had Sci Meth at the time, I'll have to x2 check the prereq thing. Thanks!

[Unimatrix11]

any numbers on the boni ?

[joncnunn]

I don't have them, usually it only makes 1 turn difference stated which is within margin of error considering what the economy should be producing a few turns from then.