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

There is a place where if I stand up straight, I will still be considered sideways.

As shown in the picture below, we can see a boy hanging on the tree branch to save his life. There are various ways in which he can die like1. A snake hanging toward the right waiting to bite the boy.2. A roaring Lion near the tree.3. Two crocodiles are ready to attack if the boy reaches near water. The tree is chopped to some extent, so can fall as if he moves a lot. Can you give this boy an escape plan?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

I can write cow in 13 letters.

Can You?

What 5-letter word typed in all capital letters can be read the same upside down?

What occurs twice in a week, once in a year but never in a day?

Can you find out which options fits best with the missing column?

How can I get the answer 24 by only using the numbers 8,8,3,3?

You can use the main signs add, subtract multiply and divide.

If it took eight men ten hours to build a wall, how long would it take four men to build it?