Identify the hidden meaning behind this picture?

What word is represented by this rebus?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

what does the below rebus mean?

John was piloting a plane behind a car but was never able to overtake it. Why?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.