The TTL output stage is a rather complicated pushâpull circuit known as a totem-pole output (the transistors, diode, and resistor in the right-most slice of this TTL logic gate circuit). It sinks currents better than it sources current.
The theory for spontaneous generation refers to the idea that life can produced from nonliving things. Lazzaro Spallanzani proposed in his experiement that air was necessary for spontaneous generation.
Filippo Tommaso Marinetti, the ringleader of this group, called the movement Futurism. Its members sought to capture the idea of modernity, the sensations and aesthetics of speed, movement, and industrial development.