1858-1947. German theoretical physicist.
Introduced the quantum hypothesis (1900): energy is emitted and absorbed in discrete quanta, E = h * v.
Defined the Planck constant h, the fundamental scale of quantum mechanics.
Solved the black-body radiation problem, which classical physics could not explain (the ultraviolet catastrophe).
His quantum hypothesis launched quantum mechanics, the most successful physical theory ever constructed.
Planck units (Planck length, Planck time, Planck energy) define the natural scale where quantum mechanics and gravity meet.
His revolution demonstrated that nature is fundamentally discrete at the smallest scales, a principle echoed in digital computation and tokenized systems like cyber.