"Computing" covers the advancement of time-keeping techniques, from the classic sundial to Ctesibius's use of constant water flow and primitive gear mechanisms, leading up to what is known as the Antikythera mechanism. An isolated artifact discovered in the wreckage of an ancient cargo vessel, the mechanism's origin and use are largely a mystery, but its elaborate system of gears suggest an advanced early device for calculating the positions of the heavenly bodies.

"Medicine" is mostly devoted to Galen, a Greek physician in the Roman Empire who pioneered numerous medical techniques, honing his craft on wounded gladiators and soldiers on the battlefield. The unique discovery in this episode is a human skull that implies an effort to perform a rudimentary type of brain surgery.

Robotics" is all about the great Heron of Alexandria, a clever machinist who used principles of air compression, wind power, and basic mechanics to swindle religious worshipers and entertain the masses at the theater. He also essentially invented the steam engine!