John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Who can jump higher than a Mountain?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

Move three sticks of the spiral below to form a square.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Why is it very easy to weigh a fish?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

What number comes next in this sequence:
7 8 5 5 3 4 4 _