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.
Solunar theory. The solunar theory is a hypothesis that animals and fishes move according to the location of the moon in comparison to their bodies. The theory was laid out in 1926 by John Alden Knight, but was said to be used by hunters and fishermen long before the time it was published.