On Tuesday I bought the new German stamps.
On of them is this:
125 years Beams of Electric Power (issued 02-11-2013)
The Beams of Electric Power were discovered by Heinrich Hertz.
Heinrich Hertz was born in 1857. He is one of the greatest physicians in the world and from 1885 to 1889 he was the most significant scientist at the “Technischen Hochschule Karlsruhe”. Hermann von Helmholtz presented Hertz’ report about the Beams of Electric Power at the Prussian Academy of Sciences in 1888. Heinrich Hertz died in 1894.
I bought also a First Day Sheet.