noone no one knows
...That's right, nobody can be sure for definite, but some of the prime candidates would be Genghis Khan, the Roman Emperor Nero, several of the Mediaeval Chinese Emperors, Ivan the Terrible, Adolf Hitler, Josef Stalin, Pol Pot, and President Harry S. Truman (who authorised the atomic attacks on Hiroshima and Nagasaki). There are others, of course....
Mitch Delozier Killed 345,000 people in one night with one knife
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It is difficult to definitively determine the biggest murderer in all of time due to limited historical records and varying definitions of murder. However, figures like Joseph Stalin, Mao Zedong, and Genghis Khan are often cited for their roles in significant loss of life.
The biggest of all water forms is the ocean, which covers about 71% of the Earth's surface.
The place with the biggest time difference with California is the Line Islands in Kiribati, which is 21 hours ahead of California time.
Joseph Stalin, the Soviet leader, is often cited as one of the biggest murderers of the 20th century due to the millions of deaths under his regime resulting from forced labor camps, purges, and man-made famines.
The egg (ovum). The biggest cell of any living animal is the Ostrich Egg.
All of it - to - a single photon.