What you cannot hold but it is yours?

How many triangles can you find in this given picture?

What number when divided in half becomes zero?

Forwards I am heavy, backward I am not. What am I?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

How could a baby fall out of a twenty-story building onto the ground and live?

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

I have branches, but no fruit, trunk or leaves. What am I?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?