You both invest equal funds and get a random tech that you can research after 30 turns. Either person can ask for an agreement, but it makes no difference.
They can be really bad if you beeline (I blitzed the top of the tree on an isolated site and got Horseback riding from a 500 gold one when I could research the tech in one turn).
They can be really bad if you beeline (I blitzed the top of the tree on an isolated site and got Horseback riding from a 500 gold one when I could research the tech in one turn).