Why 42? For the literal-minded and those unfamiliar with terms like "base thirteen," quote "Cave man" lays out following sentence in Scrabble stones: "What do you get if you multiply six by nine?"
Arthur: Six by nine? Forty-two? You know, I've always felt that there was something fundamentally wrong with the Universe. (Faint and distant voice:) Base thirteen! That's the bit many miss.
This is a number system in which the number 10 is equivalent to our more familiar decimal 13. A base 13 number 42, therefore, is the same as four 13s plus 2, or decimal 54. So "six by nine" (six times nine) or decimal 54 is, in base 13, 42. For the mystically inclined, 42 in base 13 is the same as 101010 in binary (base 2). This could mean almost anything, For example, there are many mentions of the number in the Book of Revelation (for Kate_the_Grate). Others can find 42s anywhere and everywhere. eg. The angle at which light reflects off of water to create a rainbow is 42 degrees.
Two physical constants in the universe are the speed of light and the diameter of a proton. It takes light 10 to the minus 42nd power seconds to cross the diameter of a proton.
The sum of the ordinal alphabetic positions of the initials (SPG) for Stan (P.) Gibilisco, an oft-published science and technology writer, is equal to 42 (S=19, P=16, G=7).
A barrel holds 42 gallons...
So you see my late friend knew what he was writing,
“We'll be saying a big hello to all intelligent lifeforms everywhere and to everyone else out there, the secret is to bang the rocks together, guys.”