What has a ring but no finger?

What question can you never answer yes to?

Before Mount Everest was discovered, what was the highest mountain in the world?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

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

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Which famous Hollywood movie name is hidden in the below rebus?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

A spy was in Canada trying to steal insider information on how to set up new Maple Syrup factories in their country. He was introduced to the operations manager of the biggest factory in Canada. However, the manager was suspicious and decided to test him with a question before he trusted him. So he asked, “What would you be sure to find in the middle of Toronto?” The spy thought fast and came up with an answer for the manager. What was his answer?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?