What happened when the wheel was invented?

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?

Be active and find the killer in the picture Riddle below.

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

The answer I give is yes, but what I mean is no. What was the question?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?