What is both possible and impossible at the same time?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

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?

Which wheel of car does not rotate when you turn your car right?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

What do you answer even though it never asks you questions?

Where do fish keep their money?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?