Veterans and contemporaries of that war are dying and soon they'll be gone. So I considered it important to recall some of the dry facts.
World War II was the most widespread war in history, served in the war of 72 States that existed at the time (80% of the world population).
Combat operations were conducted on the territory of three continents and in the waters of the four oceans.
It resulted in 50 million to over 70 million fatalities.
These deaths make the war the deadliest conflict in human history.