Questions answered - well, sort of

So at the beginning of last week, I put forth several questions that have been puzzling me. I did some investigating, asked a few people, and finally have some answers. Here they are:

How does one boil an egg without it cracking when placed in the pot?
My friend, WRM, in Cape Town has the answer. "Put metal spoon in water before egg. Sprinkle salt in water before putting egg in. Put egg in metal spoon and lower slowly into boiling water."

Why does the price of gas/petrol keep increasing when it's widely known when you increase the price of gas, the price of EVERYTHING else increases as well?
That's an easy one. Because we're in the Middle East to instill democracy.

Why are there so many commercials on TV?

Because the TV networks are getting (even more) greedy and want more ad revenue.

Why does it take a letter mailed on the east coast destined for the west coast four days to reach its destination when I can fly to another continent in just six hours?
Because postal service employees only work for 2 hours a day. Duh!

Why are there only 2 sexes?
Well, according to the BBC, "Scientists in Britain believe that the reason there are only two sexes is due to a bacterial infection our ancestors caught about two billion years ago.

There is no end to the diversity of life on Earth, so why most species have only two sexes has been puzzling scientists around the world for many years.

Mushrooms have as many as 36,000 sexes, and a strange growth called slime mould has about thirteen. But these are rare exceptions to the almost universal rule that life on earth is divided into two sexes."

Who killed JFK?
According to friend, Wikipedia, there are several assassination theories: "There exist a vast array of conspiracy theories regarding the assassination of U.S. President John F. Kennedy. Such theories began to be generated soon after his death and continue to be proposed today. Many of these theories propose a criminal conspiracy involving parties such as the Federal Reserve, the Central Intelligence Agency (CIA), the KGB, the Mafia, Federal Bureau of Investigation (FBI) director J. Edgar Hoover, Vice President Lyndon B. Johnson, Richard Nixon, Fidel Castro, Cuban exile groups opposed to the Castro government and the military and/or government interests of the United States." So I guess we don't really know.