Leonardo's robot

Leonardo's robot refers to a humanoid automaton designed by Leonardo da Vinci around the year 1495.

The design notes for the robot appear in sketchbooks that were rediscovered in the 1950s. It is not known whether or not an attempt was made to build the device.

The robot is a knight, clad in German-Italian medieval armor, that is apparently able to make several human-like motions. These motions included sitting up, moving its arms, neck, and an anatomically correct jaw. It is partially the fruit of Leonardo's anatomical research in the Canon of Proportions as described in the Vitruvian Man.

Bus network topology

A bus network topology is a network architecture in which a set of clients are connected via a shared communications line, called a bus. There are several common instances of the bus architecture, including one in the motherboard of most computers, and those in some versions of Ethernet networks.

Bus networks are the simplest way to connect multiple clients, but often have problems when two clients want to transmit at the same time on the same bus. Thus systems which use bus network architectures normally have some scheme of collision handling or collision avoidance for communication on the bus, quite often using Carrier Sense Multiple Access or the presence of a bus master which controls access to the shared bus resource.

A true bus network is passive – the computers on the bus simply listen for a signal; they are not responsible for moving the signal along. However, many active architectures can also be described as a "bus", as they provide the same logical functions as a passive bus; for example, switched Ethernet can still be regarded as a logical bus network, if not a physical one. Indeed, the hardware may be abstracted away completely in the case of a software bus.