Google loves to slip in-jokes and hidden features known as "easter eggs" into its products. Here are 15 of our favourites.
1) Google Reader ninja
Probably the finest - and certainly the most childish - Google easter egg. Using the arrow keys, type "up, up, down, down, left, right, left, right, B, A" while using the firm's RSS feed reader, and a little ninja appears on the left of the screen, which turns partially blue.
It's a play on the cheat code that worked on early Nintendo video games produced by Konami, the Japanese entertainment company.
6) The meaning of life
Douglas Adams' The Hitchhiker's Guide to the Galaxy is the geek bible, and it seems that Google's engineers are big fans. Type "answer to life, the universe and everything" into the query box and "42" comes out as the top result.
rest here