In Civilization Beyond Earth the technologies are divided in two types: * Branch or Primary technology: this is a main line of development, representing a broader approach to some subject. In the web branch techs are shown bigger, and always at the top of a technology 'cluster'. Branch technologies are required to advance and unlock higher tier technologies - this is illustrated in the web by the lines connecting the main techs (branch techs). Note, however, that unlike Civilization V, you don't need all lesser technologies to unlock a greater one - you just need one! At the same time, researching a branch technology also unlocks several deeper technologies, also known as 'leaf' techs. Branch techs enable access to main units and abilities, important Buildings, etc. * Leaf or Second