Guess My B'day

Source: Tanya Khovanova Blog

My birthday is in January. What is the smallest number of yes/no questions you need to ask to determine the day of my birthday.

Some Interesting Mathematics blogs

I keep on hunting the internet for good mathematical puzzles and discussions , sometimes I stumble upon very unknown and good to know mathmatical facts.

http://blog.tanyakhovanova.com/
http://gurmeet.net/puzzles/
http://pratikpoddarcse.blogspot.com/
http://mathematicsbloggers.blogspot.com/