There's no accounting for compatibility. You and a certain coworker get along like lambs. Your analytical minds fit perfectly into each other. A lot can be achieved when you join forces with someone like this. Talk about your intentions (workwise, at least), synchronize your watches, and tackle your challenges together. A problem on wednesday will require two heads, and thursday and friday will be hectic, days that will either go really well or really badly depending (in large part) on you. Communicate constantly. You'll go into the weekend still buzzing.