What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Can you count the number of squares in the figure below?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Find the next number in the series.
1 10 24 43 67 ?

Find the number of squares in the below picture

Can you find out the missing number in the grid?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes