It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Count the number of squares in the picture below.

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

What is the Surname of Barbie Doll?

Can you decipher the below rebus?

PBLUESAISNUERSES

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

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

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?