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Happy Birthday!
Max Karl Ernst Ludwig Planck

Born: April 23, 1858 in Kiel, Germany
Died: October 4, 1947 in Göttingen, Germany

Planck proposed that radiant energy could not have an arbitrary value.  Instead, energy could only be emitted in small discrete amounts.  Thus, he coined the word "quanta" that would become the name of an entire field of theoretical physics.  For this achievement, Planck won the Nobel Prize in 1918.

This plaque is proudly displayed at the entrance to the library of Humboldt University in Berlin where Planck had been a professor.