What happened when the wheel was invented?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

I am quite hot but become too cold if you remove the first two letters. What am I?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

Count the number of squares in the picture below.

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?