Question #25

Identify

Answer: Mr. Zip introduced by the US post office department to encourage general public to include ZIP code in all mailings.

Question #24

What?

Answer: Auroville City

Question #23

Sitter.
Barber, berry, curry, liar, grandfather.
What are these?

Answer: These are some famous paradoxes

Question # 22

The two pictures on the left should be enough.
Click image to enlarge.

Went uncracked, though Kaushik came close.
Answer: Battle of the sexes.
Top Left is a picture of a game "Battle of the Sexes" used in the game theory.
Bottom Left is Billy Jean King winning the "Battle of the sexes" game.
Third is of a pop singer Ludacris whose album "Battle of the sexes" will release soon.

Question # 21

Especially for cyber geeks

Answer: Unreleased versions of Microsoft Windows (Nashville, Neptune, Cairo)
              Anticlockwise from top right : Nashville, Neptune, Cairo

Question #20

Elementary. Identify.

Went uncracked!
Answer: Sidney Paget
He is best known for the illustrations that accompanied Sherlock Holmes in The Strand magazine. Although it is widely rumored that he based Holmes' appearance on that of his brother, Walter - his brother Henry Marriott has categorically denied it.

Question #19

Id the two kids. What is their claim to fame

Cracked by Gokul. Partially cracked by Arun Mallya and Kaushik.
Answer: Charlie (left) and Harry (right) in the Youtube's most viewed video "Charlie bit my finger .. again".