[Answer] 1. This leader was in charge of the Khmer Rouge communist movement in Cambodia. His attempts to "cleanse" Cambodia resulted in millions of deaths.

Step 1 : Introduction to the question "1. This leader was in charge of the Khmer Rouge communist movement in Cambodia. His attempts to "cleanse" Cambodia resulted in millions of deaths."

...1. Pol Pot 2. Kim Il-Sung 3. Kim Jong-Il 4. Tou Samouth Pol Pot was the leader of Cambodia's "Khmer Rouge" communist movement. It is estimated he caused between 1.7-2.5 million deaths. He favored "agrarian socialism", which involved relocating people from towns to rural environments to work on his "special projects." Pol Pot, whose original name was Saloth Sar, wanted a new beginning, a "Year Zero." About 20% of the Cambodian population died at the hands of Pol Pot's leadership. His cruel reign was brought to an end during the Cambodian-Vietnamese War of 1978-79. Tou Samouth was Pol Pot's mentor. Kim Jong-Il and Kim Il-Sung are both North Korean despots.

[Answer] 1. Nov. 22, 1963 saw the deaths of authors C.S. Lewis and Aldous Huxley. Which President of the United States of America also died that day?

Step 1 : Introduction to the question "1. Nov. 22, 1963 saw the deaths of authors C.S. Lewis and Aldous Huxley. Which President of the United States of America also died that day? "

...1. Lyndon B. Johnson 2. John F. Kennedy 3. Harry S. Truman 4. Franklin D. Roosevelt President John F. Kennedy, C.S. Lewis and Aldous Huxley all died on Nov. 22, 1963. President Kennedy was assassinated by Lee Harvey Oswald in Dallas, Texas. C.S. Lewis, author of the 1950s "The Chronicles of Narnia" series, died after battling kidney problems for two years while Aldous Huxley, author of the 1931 novel "Brave New World", died after a battle with laryngeal cancer.

[Answer] What snake is responsible for more human deaths than all other snakes combined?

Step 1 : Introduction to the question "What snake is responsible for more human deaths than all other snakes combined?"

...The snake that kills the most people each year doesn't have the most potent venom found in the snake population. What it does have is an incredibly bad temper, making it very aggressive. This means it bites early and it bites often. For this reason, scientists believe it is responsible for more deaths yearly than all other snakes combined. The saw-scaled viper's venom is only lethal in less than 10 percent of victims who don't seek treatment. But that bad temper propels it to the top of the most dangerous snake list. Source: Britannica.com