Italian postage stamp commemorating the 25th anniversary of Enrico Fermi's first nuclear chain reaction
Depicts Enrico Fermi with nuclear test pile (reactor).
Stamp depicts a portrait of Albert Einstein.
Cachet depicts a bust of Avogadro as well as text of Avogadro's law, which states that equal volumes of gases under the same conditions of temperature and pressure will contain equal numbers of molecules. The stamp…