Artificial Intelligence, Nanotechnology, Immortality.
imagine a very tall human standing on the earth, with a head that reaches the International Space Station (431 km/268 mi high). The giant is reaching down with his hand (30 km/19 mi across) to build “objects using materials between the size of a grain of sand [.25 mm] and an eyeball [2.5 cm].”⁶⁹