General Science
- Parking Distance Control, is a system used in cars to measure the distance between the car and obstacles
- Pulsed DC, the form of wave produced from a half-wave rectifier or a full-wave rectifier
- Pyroclastic density current, a highly energetic ground current of superheated gases containing a high density of suspended pyroclastic fragments resulting from a volcanic explosion
- Plasmacytoid dendritic cell, a type of mammalian cell that functions as a component of the innate immune system
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“To judge from a single conversation, he made the impression of a narrow and very English mind; of one who paid for his rare elevation by general tameness and conformity. Off his own beat, his opinions were of no value.”
—Ralph Waldo Emerson (1803–1882)
“Whilst Marx turned the Hegelian dialectic outwards, making it an instrument with which he could interpret the facts of history and so arrive at an objective science which insists on the translation of theory into action, Kierkegaard, on the other hand, turned the same instruments inwards, for the examination of his own soul or psychology, arriving at a subjective philosophy which involved him in the deepest pessimism and despair of action.”
—Sir Herbert Read (1893–1968)